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Subject: Re: [PATCH] ocfs2: cleanup journal init and shutdown
To:     Valentin Vidic <vvidic@valentin-vidic.from.hr>,
        Mark Fasheh <mark@fasheh.com>,
        Joel Becker <jlbec@evilplan.org>, ocfs2-devel@oss.oracle.com,
        linux-kernel@vger.kernel.org
References: <20211002143640.26512-1-vvidic@valentin-vidic.from.hr>
From:   Joseph Qi <joseph.qi@linux.alibaba.com>
Message-ID: <faceeac2-7419-e500-12ba-ab11b915e660@linux.alibaba.com>
Date:   Sat, 9 Oct 2021 17:04:09 +0800
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On 10/2/21 10:36 PM, Valentin Vidic wrote:
> Allocate and free struct ocfs2_journal in ocfs2_journal_init and
> ocfs2_journal_shutdown. Init and release of system inodes references
> the journal so reorder calls to make sure they work correctly.
> 
> Signed-off-by: Valentin Vidic <vvidic@valentin-vidic.from.hr>
> ---
>  fs/ocfs2/inode.c   |  4 ++--
>  fs/ocfs2/journal.c | 25 +++++++++++++++++++++----
>  fs/ocfs2/journal.h |  3 +--
>  fs/ocfs2/super.c   | 40 +++-------------------------------------
>  4 files changed, 27 insertions(+), 45 deletions(-)
> 
> diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
> index bc8f32fab964..c2275895c229 100644
> --- a/fs/ocfs2/inode.c
> +++ b/fs/ocfs2/inode.c
> @@ -125,7 +125,6 @@ struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, unsigned flags,
>  	struct inode *inode = NULL;
>  	struct super_block *sb = osb->sb;
>  	struct ocfs2_find_inode_args args;
> -	journal_t *journal = OCFS2_SB(sb)->journal->j_journal;
>  
>  	trace_ocfs2_iget_begin((unsigned long long)blkno, flags,
>  			       sysfile_type);
> @@ -172,10 +171,11 @@ struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, unsigned flags,
>  	 * part of the transaction - the inode could have been reclaimed and
>  	 * now it is reread from disk.
>  	 */
> -	if (journal) {
> +	if (OCFS2_SB(sb)->journal) {

Use osb->journal instead.

>  		transaction_t *transaction;
>  		tid_t tid;
>  		struct ocfs2_inode_info *oi = OCFS2_I(inode);
> +		journal_t *journal = OCFS2_SB(sb)->journal->j_journal;

Ditto.

>  
>  		read_lock(&journal->j_state_lock);
>  		if (journal->j_running_transaction)
> diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
> index 4f15750aac5d..d50f0ac3fd46 100644
> --- a/fs/ocfs2/journal.c
> +++ b/fs/ocfs2/journal.c
> @@ -810,19 +810,34 @@ void ocfs2_set_journal_params(struct ocfs2_super *osb)
>  	write_unlock(&journal->j_state_lock);
>  }
>  
> -int ocfs2_journal_init(struct ocfs2_journal *journal, int *dirty)
> +int ocfs2_journal_init(struct ocfs2_super *osb, int *dirty)
>  {
>  	int status = -1;
>  	struct inode *inode = NULL; /* the journal inode */
>  	journal_t *j_journal = NULL;
> +	struct ocfs2_journal *journal = NULL;
>  	struct ocfs2_dinode *di = NULL;
>  	struct buffer_head *bh = NULL;
> -	struct ocfs2_super *osb;
>  	int inode_lock = 0;
>  
> -	BUG_ON(!journal);
> +	/* initialize our journal structure */
> +	journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
> +	if (!journal) {
> +		mlog(ML_ERROR, "unable to alloc journal\n");
> +		status = -ENOMEM;
> +		goto done;
> +	}
> +	osb->journal = journal;
> +	journal->j_osb = osb;
>  
> -	osb = journal->j_osb;
> +	atomic_set(&journal->j_num_trans, 0);
> +	init_rwsem(&journal->j_trans_barrier);
> +	init_waitqueue_head(&journal->j_checkpointed);
> +	spin_lock_init(&journal->j_lock);
> +	journal->j_trans_id = 1UL;
> +	INIT_LIST_HEAD(&journal->j_la_cleanups);
> +	INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
> +	journal->j_state = OCFS2_JOURNAL_FREE;
>  
>  	/* already have the inode for our journal */
>  	inode = ocfs2_get_system_file_inode(osb, JOURNAL_SYSTEM_INODE,
> @@ -1031,6 +1046,8 @@ void ocfs2_journal_shutdown(struct ocfs2_super *osb)
>  //	up_write(&journal->j_trans_barrier);

Could you please clean up the above line as well?

Thanks,
Joseph

>  done:
>  	iput(inode);
> +	kfree(journal);
> +	osb->journal = NULL;
>  }
>  
>  static void ocfs2_clear_journal_error(struct super_block *sb,
> diff --git a/fs/ocfs2/journal.h b/fs/ocfs2/journal.h
> index d158acb8b38a..8dcb2f2cadbc 100644
> --- a/fs/ocfs2/journal.h
> +++ b/fs/ocfs2/journal.h
> @@ -167,8 +167,7 @@ int ocfs2_compute_replay_slots(struct ocfs2_super *osb);
>   *  ocfs2_start_checkpoint - Kick the commit thread to do a checkpoint.
>   */
>  void   ocfs2_set_journal_params(struct ocfs2_super *osb);
> -int    ocfs2_journal_init(struct ocfs2_journal *journal,
> -			  int *dirty);
> +int    ocfs2_journal_init(struct ocfs2_super *osb, int *dirty);
>  void   ocfs2_journal_shutdown(struct ocfs2_super *osb);
>  int    ocfs2_journal_wipe(struct ocfs2_journal *journal,
>  			  int full);
> diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
> index 5c914ce9b3ac..1286b88b6fa1 100644
> --- a/fs/ocfs2/super.c
> +++ b/fs/ocfs2/super.c
> @@ -1894,8 +1894,6 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
>  	/* This will disable recovery and flush any recovery work. */
>  	ocfs2_recovery_exit(osb);
>  
> -	ocfs2_journal_shutdown(osb);
> -
>  	ocfs2_sync_blockdev(sb);
>  
>  	ocfs2_purge_refcount_trees(osb);
> @@ -1918,6 +1916,8 @@ static void ocfs2_dismount_volume(struct super_block *sb, int mnt_err)
>  
>  	ocfs2_release_system_inodes(osb);
>  
> +	ocfs2_journal_shutdown(osb);
> +
>  	/*
>  	 * If we're dismounting due to mount error, mount.ocfs2 will clean
>  	 * up heartbeat.  If we're a local mount, there is no heartbeat.
> @@ -2016,7 +2016,6 @@ static int ocfs2_initialize_super(struct super_block *sb,
>  	int i, cbits, bbits;
>  	struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
>  	struct inode *inode = NULL;
> -	struct ocfs2_journal *journal;
>  	struct ocfs2_super *osb;
>  	u64 total_blocks;
>  
> @@ -2197,33 +2196,6 @@ static int ocfs2_initialize_super(struct super_block *sb,
>  
>  	get_random_bytes(&osb->s_next_generation, sizeof(u32));
>  
> -	/* FIXME
> -	 * This should be done in ocfs2_journal_init(), but unknown
> -	 * ordering issues will cause the filesystem to crash.
> -	 * If anyone wants to figure out what part of the code
> -	 * refers to osb->journal before ocfs2_journal_init() is run,
> -	 * be my guest.
> -	 */
> -	/* initialize our journal structure */
> -
> -	journal = kzalloc(sizeof(struct ocfs2_journal), GFP_KERNEL);
> -	if (!journal) {
> -		mlog(ML_ERROR, "unable to alloc journal\n");
> -		status = -ENOMEM;
> -		goto bail;
> -	}
> -	osb->journal = journal;
> -	journal->j_osb = osb;
> -
> -	atomic_set(&journal->j_num_trans, 0);
> -	init_rwsem(&journal->j_trans_barrier);
> -	init_waitqueue_head(&journal->j_checkpointed);
> -	spin_lock_init(&journal->j_lock);
> -	journal->j_trans_id = (unsigned long) 1;
> -	INIT_LIST_HEAD(&journal->j_la_cleanups);
> -	INIT_WORK(&journal->j_recovery_work, ocfs2_complete_recovery);
> -	journal->j_state = OCFS2_JOURNAL_FREE;
> -
>  	INIT_WORK(&osb->dquot_drop_work, ocfs2_drop_dquot_refs);
>  	init_llist_head(&osb->dquot_drop_list);
>  
> @@ -2404,7 +2376,7 @@ static int ocfs2_check_volume(struct ocfs2_super *osb)
>  						  * ourselves. */
>  
>  	/* Init our journal object. */
> -	status = ocfs2_journal_init(osb->journal, &dirty);
> +	status = ocfs2_journal_init(osb, &dirty);
>  	if (status < 0) {
>  		mlog(ML_ERROR, "Could not initialize journal!\n");
>  		goto finally;
> @@ -2513,12 +2485,6 @@ static void ocfs2_delete_osb(struct ocfs2_super *osb)
>  
>  	kfree(osb->osb_orphan_wipes);
>  	kfree(osb->slot_recovery_generations);
> -	/* FIXME
> -	 * This belongs in journal shutdown, but because we have to
> -	 * allocate osb->journal at the start of ocfs2_initialize_osb(),
> -	 * we free it here.
> -	 */
> -	kfree(osb->journal);
>  	kfree(osb->local_alloc_copy);
>  	kfree(osb->uuid_str);
>  	kfree(osb->vol_label);
>