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Date:   Wed, 5 May 2021 14:37:17 -0700
From:   "Darrick J. Wong" <djwong@...nel.org>
To:     Leah Rumancik <leah.rumancik@...il.com>
Cc:     linux-ext4@...r.kernel.org, tytso@....edu
Subject: Re: [PATCH v3 1/3] ext4: add flags argument to jbd2_journal_flush

On Tue, May 04, 2021 at 04:35:48PM +0000, Leah Rumancik wrote:
> This patch will allow the following commit to pass a discard flag,
> enabling discarding the journal blocks while flushing the journal.
> 
> Signed-off-by: Leah Rumancik <leah.rumancik@...il.com>
> ---
>  fs/ext4/inode.c      | 4 ++--
>  fs/ext4/ioctl.c      | 6 +++---
>  fs/ext4/super.c      | 6 +++---
>  fs/jbd2/journal.c    | 3 +--
>  fs/ocfs2/alloc.c     | 2 +-
>  fs/ocfs2/journal.c   | 8 ++++----
>  include/linux/jbd2.h | 2 +-
>  7 files changed, 15 insertions(+), 16 deletions(-)
> 
> diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
> index 0948a43f1b3d..d308c57559e3 100644
> --- a/fs/ext4/inode.c
> +++ b/fs/ext4/inode.c
> @@ -3225,7 +3225,7 @@ static sector_t ext4_bmap(struct address_space *mapping, sector_t block)
>  		ext4_clear_inode_state(inode, EXT4_STATE_JDATA);
>  		journal = EXT4_JOURNAL(inode);
>  		jbd2_journal_lock_updates(journal);
> -		err = jbd2_journal_flush(journal);
> +		err = jbd2_journal_flush(journal, false);
>  		jbd2_journal_unlock_updates(journal);
>  
>  		if (err)
> @@ -6007,7 +6007,7 @@ int ext4_change_inode_journal_flag(struct inode *inode, int val)
>  	if (val)
>  		ext4_set_inode_flag(inode, EXT4_INODE_JOURNAL_DATA);
>  	else {
> -		err = jbd2_journal_flush(journal);
> +		err = jbd2_journal_flush(journal, false);
>  		if (err < 0) {
>  			jbd2_journal_unlock_updates(journal);
>  			percpu_up_write(&sbi->s_writepages_rwsem);
> diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
> index e9b0a1fa2ba8..ef809feb7e77 100644
> --- a/fs/ext4/ioctl.c
> +++ b/fs/ext4/ioctl.c
> @@ -701,7 +701,7 @@ static long ext4_ioctl_group_add(struct file *file,
>  	err = ext4_group_add(sb, input);
>  	if (EXT4_SB(sb)->s_journal) {
>  		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
> -		err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
> +		err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, false);
>  		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
>  	}
>  	if (err == 0)
> @@ -879,7 +879,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>  		err = ext4_group_extend(sb, EXT4_SB(sb)->s_es, n_blocks_count);
>  		if (EXT4_SB(sb)->s_journal) {
>  			jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
> -			err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
> +			err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, false);
>  			jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
>  		}
>  		if (err == 0)
> @@ -1022,7 +1022,7 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
>  		if (EXT4_SB(sb)->s_journal) {
>  			ext4_fc_mark_ineligible(sb, EXT4_FC_REASON_RESIZE);
>  			jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
> -			err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
> +			err2 = jbd2_journal_flush(EXT4_SB(sb)->s_journal, false);
>  			jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
>  		}
>  		if (err == 0)
> diff --git a/fs/ext4/super.c b/fs/ext4/super.c
> index 3868377dec2d..449ed222cdf8 100644
> --- a/fs/ext4/super.c
> +++ b/fs/ext4/super.c
> @@ -5613,7 +5613,7 @@ static int ext4_mark_recovery_complete(struct super_block *sb,
>  		return 0;
>  	}
>  	jbd2_journal_lock_updates(journal);
> -	err = jbd2_journal_flush(journal);
> +	err = jbd2_journal_flush(journal, false);
>  	if (err < 0)
>  		goto out;
>  
> @@ -5755,7 +5755,7 @@ static int ext4_freeze(struct super_block *sb)
>  		 * Don't clear the needs_recovery flag if we failed to
>  		 * flush the journal.
>  		 */
> -		error = jbd2_journal_flush(journal);
> +		error = jbd2_journal_flush(journal, false);
>  		if (error < 0)
>  			goto out;
>  
> @@ -6346,7 +6346,7 @@ static int ext4_quota_on(struct super_block *sb, int type, int format_id,
>  		 * otherwise be livelocked...
>  		 */
>  		jbd2_journal_lock_updates(EXT4_SB(sb)->s_journal);
> -		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal);
> +		err = jbd2_journal_flush(EXT4_SB(sb)->s_journal, false);
>  		jbd2_journal_unlock_updates(EXT4_SB(sb)->s_journal);
>  		if (err)
>  			return err;
> diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
> index 2dc944442802..4b7953934c82 100644
> --- a/fs/jbd2/journal.c
> +++ b/fs/jbd2/journal.c
> @@ -2251,8 +2251,7 @@ EXPORT_SYMBOL(jbd2_journal_clear_features);
>   * Filesystems can use this when remounting readonly to ensure that
>   * recovery does not need to happen on remount.
>   */
> -
> -int jbd2_journal_flush(journal_t *journal)
> +int jbd2_journal_flush(journal_t *journal, bool discard)
>  {
>  	int err = 0;
>  	transaction_t *transaction = NULL;

The division of code between patches 1 and 2 is a bit ... unusual?

I would have had patch 1 actually wire up this parameter, and put the
userspace ioctl additions in patch 2.

At any rate, I defer to Ted; if he told you to do it this way, then it's
fine with me, no need to churn your series for the same end-result.

--D

> diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
> index 78710788c237..5ff2c42cb46c 100644
> --- a/fs/ocfs2/alloc.c
> +++ b/fs/ocfs2/alloc.c
> @@ -6020,7 +6020,7 @@ int __ocfs2_flush_truncate_log(struct ocfs2_super *osb)
>  	 * Then truncate log will be replayed resulting in cluster double free.
>  	 */
>  	jbd2_journal_lock_updates(journal->j_journal);
> -	status = jbd2_journal_flush(journal->j_journal);
> +	status = jbd2_journal_flush(journal->j_journal, false);
>  	jbd2_journal_unlock_updates(journal->j_journal);
>  	if (status < 0) {
>  		mlog_errno(status);
> diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
> index db52e843002a..1c356b29c66d 100644
> --- a/fs/ocfs2/journal.c
> +++ b/fs/ocfs2/journal.c
> @@ -310,7 +310,7 @@ static int ocfs2_commit_cache(struct ocfs2_super *osb)
>  	}
>  
>  	jbd2_journal_lock_updates(journal->j_journal);
> -	status = jbd2_journal_flush(journal->j_journal);
> +	status = jbd2_journal_flush(journal->j_journal, false);
>  	jbd2_journal_unlock_updates(journal->j_journal);
>  	if (status < 0) {
>  		up_write(&journal->j_trans_barrier);
> @@ -1002,7 +1002,7 @@ void ocfs2_journal_shutdown(struct ocfs2_super *osb)
>  
>  	if (ocfs2_mount_local(osb)) {
>  		jbd2_journal_lock_updates(journal->j_journal);
> -		status = jbd2_journal_flush(journal->j_journal);
> +		status = jbd2_journal_flush(journal->j_journal, false);
>  		jbd2_journal_unlock_updates(journal->j_journal);
>  		if (status < 0)
>  			mlog_errno(status);
> @@ -1072,7 +1072,7 @@ int ocfs2_journal_load(struct ocfs2_journal *journal, int local, int replayed)
>  
>  	if (replayed) {
>  		jbd2_journal_lock_updates(journal->j_journal);
> -		status = jbd2_journal_flush(journal->j_journal);
> +		status = jbd2_journal_flush(journal->j_journal, false);
>  		jbd2_journal_unlock_updates(journal->j_journal);
>  		if (status < 0)
>  			mlog_errno(status);
> @@ -1668,7 +1668,7 @@ static int ocfs2_replay_journal(struct ocfs2_super *osb,
>  
>  	/* wipe the journal */
>  	jbd2_journal_lock_updates(journal);
> -	status = jbd2_journal_flush(journal);
> +	status = jbd2_journal_flush(journal, false);
>  	jbd2_journal_unlock_updates(journal);
>  	if (status < 0)
>  		mlog_errno(status);
> diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
> index 99d3cd051ac3..5e4349b76997 100644
> --- a/include/linux/jbd2.h
> +++ b/include/linux/jbd2.h
> @@ -1491,7 +1491,7 @@ extern int	 jbd2_journal_invalidatepage(journal_t *,
>  				struct page *, unsigned int, unsigned int);
>  extern int	 jbd2_journal_try_to_free_buffers(journal_t *journal, struct page *page);
>  extern int	 jbd2_journal_stop(handle_t *);
> -extern int	 jbd2_journal_flush (journal_t *);
> +extern int	 jbd2_journal_flush(journal_t *journal, bool discard);
>  extern void	 jbd2_journal_lock_updates (journal_t *);
>  extern void	 jbd2_journal_unlock_updates (journal_t *);
>  
> -- 
> 2.31.1.527.g47e6f16901-goog
> 

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