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Date:   Mon, 15 Jul 2019 11:42:26 +0800
From:   Changwei Ge <chge@...ux.alibaba.com>
To:     Joseph Qi <joseph.qi@...ux.alibaba.com>, akpm@...ux-foundation.org
Cc:     Theodore Ts'o <tytso@....edu>, mark@...heh.com, jlbec@...lplan.org,
        Ross Zwisler <zwisler@...gle.com>, linux-ext4@...r.kernel.org,
        ocfs2-devel@....oracle.com
Subject: Re: [PATCH 1/2] ocfs2: use jbd2_inode dirty range scoping

Looks good to me.

On 2019/7/13 8:26 上午, Joseph Qi wrote:
> commit 6ba0e7dc64a5 ("jbd2: introduce jbd2_inode dirty range scoping")
> allow us scoping each of the inode dirty ranges associated with a given
> transaction, and ext4 already does this way.
> Now let's also use the newly introduced jbd2_inode dirty range scoping
> to prevent us from waiting forever when trying to complete a journal
> transaction in ocfs2.
>
> Signed-off-by: Joseph Qi <joseph.qi@...ux.alibaba.com>
> Reviewed-by: Ross Zwisler <zwisler@...gle.com>
Reviewed-by: Changwei Ge <chge@...ux.alibaba.com>
> ---
> v1 -> v2:
>    rename ocfs2_jbd2_file_inode() to ocfs2_jbd2_inode_add_write() to keep
>    consistent with ext4.
>    wrap several long lines.
>
>   fs/ocfs2/alloc.c   |  5 ++++-
>   fs/ocfs2/aops.c    | 13 ++++++++++---
>   fs/ocfs2/file.c    | 10 +++++++---
>   fs/ocfs2/journal.h | 11 +++++++----
>   4 files changed, 28 insertions(+), 11 deletions(-)
>
> diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
> index d1348fc..54f72ad 100644
> --- a/fs/ocfs2/alloc.c
> +++ b/fs/ocfs2/alloc.c
> @@ -6792,6 +6792,8 @@ void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
>   			      struct page *page, int zero, u64 *phys)
>   {
>   	int ret, partial = 0;
> +	loff_t start_byte = ((loff_t)page->index << PAGE_SHIFT) + from;
> +	loff_t length = to - from;
>   
>   	ret = ocfs2_map_page_blocks(page, phys, inode, from, to, 0);
>   	if (ret)
> @@ -6811,7 +6813,8 @@ void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
>   	if (ret < 0)
>   		mlog_errno(ret);
>   	else if (ocfs2_should_order_data(inode)) {
> -		ret = ocfs2_jbd2_file_inode(handle, inode);
> +		ret = ocfs2_jbd2_inode_add_write(handle, inode,
> +						 start_byte, length);
>   		if (ret < 0)
>   			mlog_errno(ret);
>   	}
> diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
> index a4c905d..8de1c9d 100644
> --- a/fs/ocfs2/aops.c
> +++ b/fs/ocfs2/aops.c
> @@ -942,7 +942,8 @@ static void ocfs2_write_failure(struct inode *inode,
>   
>   		if (tmppage && page_has_buffers(tmppage)) {
>   			if (ocfs2_should_order_data(inode))
> -				ocfs2_jbd2_file_inode(wc->w_handle, inode);
> +				ocfs2_jbd2_inode_add_write(wc->w_handle, inode,
> +							   user_pos, user_len);
>   
>   			block_commit_write(tmppage, from, to);
>   		}
> @@ -2023,8 +2024,14 @@ int ocfs2_write_end_nolock(struct address_space *mapping,
>   		}
>   
>   		if (page_has_buffers(tmppage)) {
> -			if (handle && ocfs2_should_order_data(inode))
> -				ocfs2_jbd2_file_inode(handle, inode);
> +			if (handle && ocfs2_should_order_data(inode)) {
> +				loff_t start_byte =
> +					((loff_t)tmppage->index << PAGE_SHIFT) +
> +					from;
> +				loff_t length = to - from;
> +				ocfs2_jbd2_inode_add_write(handle, inode,
> +							   start_byte, length);
> +			}
>   			block_commit_write(tmppage, from, to);
>   		}
>   	}
> diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
> index 4435df3..efe9988 100644
> --- a/fs/ocfs2/file.c
> +++ b/fs/ocfs2/file.c
> @@ -706,7 +706,9 @@ static int ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
>    * Thus, we need to explicitly order the zeroed pages.
>    */
>   static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode,
> -						struct buffer_head *di_bh)
> +						      struct buffer_head *di_bh,
> +						      loff_t start_byte,
> +						      loff_t length)
>   {
>   	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
>   	handle_t *handle = NULL;
> @@ -722,7 +724,7 @@ static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode,
>   		goto out;
>   	}
>   
> -	ret = ocfs2_jbd2_file_inode(handle, inode);
> +	ret = ocfs2_jbd2_inode_add_write(handle, inode, start_byte, length);
>   	if (ret < 0) {
>   		mlog_errno(ret);
>   		goto out;
> @@ -761,7 +763,9 @@ static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
>   	BUG_ON(abs_to > (((u64)index + 1) << PAGE_SHIFT));
>   	BUG_ON(abs_from & (inode->i_blkbits - 1));
>   
> -	handle = ocfs2_zero_start_ordered_transaction(inode, di_bh);
> +	handle = ocfs2_zero_start_ordered_transaction(inode, di_bh,
> +						      abs_from,
> +						      abs_to - abs_from);
>   	if (IS_ERR(handle)) {
>   		ret = PTR_ERR(handle);
>   		goto out;
> diff --git a/fs/ocfs2/journal.h b/fs/ocfs2/journal.h
> index c0fe6ed..f37473c 100644
> --- a/fs/ocfs2/journal.h
> +++ b/fs/ocfs2/journal.h
> @@ -232,8 +232,8 @@ static inline void ocfs2_checkpoint_inode(struct inode *inode)
>    *                          ocfs2_journal_access_*() unless you intend to
>    *                          manage the checksum by hand.
>    *  ocfs2_journal_dirty    - Mark a journalled buffer as having dirty data.
> - *  ocfs2_jbd2_file_inode  - Mark an inode so that its data goes out before
> - *                           the current handle commits.
> + *  ocfs2_jbd2_inode_add_write  - Mark an inode with range so that its data goes
> + *                                out before the current handle commits.
>    */
>   
>   /* You must always start_trans with a number of buffs > 0, but it's
> @@ -603,9 +603,12 @@ static inline int ocfs2_calc_tree_trunc_credits(struct super_block *sb,
>   	return credits;
>   }
>   
> -static inline int ocfs2_jbd2_file_inode(handle_t *handle, struct inode *inode)
> +static inline int ocfs2_jbd2_inode_add_write(handle_t *handle, struct inode *inode,
> +					     loff_t start_byte, loff_t length)
>   {
> -	return jbd2_journal_inode_add_write(handle, &OCFS2_I(inode)->ip_jinode);
> +	return jbd2_journal_inode_ranged_write(handle,
> +					       &OCFS2_I(inode)->ip_jinode,
> +					       start_byte, length);
>   }
>   
>   static inline int ocfs2_begin_ordered_truncate(struct inode *inode,

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