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Date:   Mon, 20 Sep 2021 15:57:46 +0200
From:   Jan Kara <jack@...e.cz>
To:     Zhang Yi <yi.zhang@...wei.com>
Cc:     linux-ext4@...r.kernel.org, tytso@....edu,
        adilger.kernel@...ger.ca, jack@...e.cz, yukuai3@...wei.com
Subject: Re: [PATCH v5 1/3] ext4: factor out ext4_fill_raw_inode()

On Wed 01-09-21 10:09:53, Zhang Yi wrote:
> Factor out ext4_fill_raw_inode() from ext4_do_update_inode(), which is
> use to fill the in-mem inode contents into the inode table buffer, in
> preparation for initializing the exclusive inode buffer without reading
> the block in __ext4_get_inode_loc().
> 
> Signed-off-by: Zhang Yi <yi.zhang@...wei.com>

Looks good. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  fs/ext4/inode.c | 85 +++++++++++++++++++++++++++----------------------
>  1 file changed, 47 insertions(+), 38 deletions(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 8323d3e8f393..c7186460c14d 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -4902,9 +4902,8 @@ struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
>  	return ERR_PTR(ret);
>  }
>  
> -static int ext4_inode_blocks_set(handle_t *handle,
> -				struct ext4_inode *raw_inode,
> -				struct ext4_inode_info *ei)
> +static int ext4_inode_blocks_set(struct ext4_inode *raw_inode,
> +				 struct ext4_inode_info *ei)
>  {
>  	struct inode *inode = &(ei->vfs_inode);
>  	u64 i_blocks = READ_ONCE(inode->i_blocks);
> @@ -5007,37 +5006,16 @@ static void ext4_update_other_inodes_time(struct super_block *sb,
>  	rcu_read_unlock();
>  }
>  
> -/*
> - * Post the struct inode info into an on-disk inode location in the
> - * buffer-cache.  This gobbles the caller's reference to the
> - * buffer_head in the inode location struct.
> - *
> - * The caller must have write access to iloc->bh.
> - */
> -static int ext4_do_update_inode(handle_t *handle,
> -				struct inode *inode,
> -				struct ext4_iloc *iloc)
> +static int ext4_fill_raw_inode(struct inode *inode, struct ext4_inode *raw_inode)
>  {
> -	struct ext4_inode *raw_inode = ext4_raw_inode(iloc);
>  	struct ext4_inode_info *ei = EXT4_I(inode);
> -	struct buffer_head *bh = iloc->bh;
> -	struct super_block *sb = inode->i_sb;
> -	int err = 0, block;
> -	int need_datasync = 0, set_large_file = 0;
>  	uid_t i_uid;
>  	gid_t i_gid;
>  	projid_t i_projid;
> +	int block;
> +	int err;
>  
> -	spin_lock(&ei->i_raw_lock);
> -
> -	/*
> -	 * For fields not tracked in the in-memory inode, initialise them
> -	 * to zero for new inodes.
> -	 */
> -	if (ext4_test_inode_state(inode, EXT4_STATE_NEW))
> -		memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size);
> -
> -	err = ext4_inode_blocks_set(handle, raw_inode, ei);
> +	err = ext4_inode_blocks_set(raw_inode, ei);
>  
>  	raw_inode->i_mode = cpu_to_le16(inode->i_mode);
>  	i_uid = i_uid_read(inode);
> @@ -5079,16 +5057,8 @@ static int ext4_do_update_inode(handle_t *handle,
>  		raw_inode->i_file_acl_high =
>  			cpu_to_le16(ei->i_file_acl >> 32);
>  	raw_inode->i_file_acl_lo = cpu_to_le32(ei->i_file_acl);
> -	if (READ_ONCE(ei->i_disksize) != ext4_isize(inode->i_sb, raw_inode)) {
> -		ext4_isize_set(raw_inode, ei->i_disksize);
> -		need_datasync = 1;
> -	}
> -	if (ei->i_disksize > 0x7fffffffULL) {
> -		if (!ext4_has_feature_large_file(sb) ||
> -				EXT4_SB(sb)->s_es->s_rev_level ==
> -		    cpu_to_le32(EXT4_GOOD_OLD_REV))
> -			set_large_file = 1;
> -	}
> +	ext4_isize_set(raw_inode, ei->i_disksize);
> +
>  	raw_inode->i_generation = cpu_to_le32(inode->i_generation);
>  	if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
>  		if (old_valid_dev(inode->i_rdev)) {
> @@ -5128,6 +5098,45 @@ static int ext4_do_update_inode(handle_t *handle,
>  		raw_inode->i_projid = cpu_to_le32(i_projid);
>  
>  	ext4_inode_csum_set(inode, raw_inode, ei);
> +	return err;
> +}
> +
> +/*
> + * Post the struct inode info into an on-disk inode location in the
> + * buffer-cache.  This gobbles the caller's reference to the
> + * buffer_head in the inode location struct.
> + *
> + * The caller must have write access to iloc->bh.
> + */
> +static int ext4_do_update_inode(handle_t *handle,
> +				struct inode *inode,
> +				struct ext4_iloc *iloc)
> +{
> +	struct ext4_inode *raw_inode = ext4_raw_inode(iloc);
> +	struct ext4_inode_info *ei = EXT4_I(inode);
> +	struct buffer_head *bh = iloc->bh;
> +	struct super_block *sb = inode->i_sb;
> +	int err;
> +	int need_datasync = 0, set_large_file = 0;
> +
> +	spin_lock(&ei->i_raw_lock);
> +
> +	/*
> +	 * For fields not tracked in the in-memory inode, initialise them
> +	 * to zero for new inodes.
> +	 */
> +	if (ext4_test_inode_state(inode, EXT4_STATE_NEW))
> +		memset(raw_inode, 0, EXT4_SB(inode->i_sb)->s_inode_size);
> +
> +	if (READ_ONCE(ei->i_disksize) != ext4_isize(inode->i_sb, raw_inode))
> +		need_datasync = 1;
> +	if (ei->i_disksize > 0x7fffffffULL) {
> +		if (!ext4_has_feature_large_file(sb) ||
> +		    EXT4_SB(sb)->s_es->s_rev_level == cpu_to_le32(EXT4_GOOD_OLD_REV))
> +			set_large_file = 1;
> +	}
> +
> +	err = ext4_fill_raw_inode(inode, raw_inode);
>  	spin_unlock(&ei->i_raw_lock);
>  	if (err) {
>  		EXT4_ERROR_INODE(inode, "corrupted inode contents");
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR

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