On 2024/4/7 14:53, Ye Bin wrote:
> "enum shrink_type" can clearly express the meaning of the parameter of
> __jbd2_journal_clean_checkpoint_list(), and there is no need to use the
> bool type.
>
> Signed-off-by: Ye Bin <[email protected]>
Looks good to me.
Reviewed-by: Zhang Yi <[email protected]>
> ---
> fs/jbd2/checkpoint.c | 16 +++++++++-------
> fs/jbd2/commit.c | 2 +-
> include/linux/jbd2.h | 4 +++-
> 3 files changed, 13 insertions(+), 9 deletions(-)
>
> diff --git a/fs/jbd2/checkpoint.c b/fs/jbd2/checkpoint.c
> index 1c97e64c4784..80c0ab98bc63 100644
> --- a/fs/jbd2/checkpoint.c
> +++ b/fs/jbd2/checkpoint.c
> @@ -337,8 +337,6 @@ int jbd2_cleanup_journal_tail(journal_t *journal)
>
> /* Checkpoint list management */
>
> -enum shrink_type {SHRINK_DESTROY, SHRINK_BUSY_STOP, SHRINK_BUSY_SKIP};
> -
> /*
> * journal_shrink_one_cp_list
> *
> @@ -472,21 +470,25 @@ unsigned long jbd2_journal_shrink_checkpoint_list(journal_t *journal,
> * journal_clean_checkpoint_list
> *
> * Find all the written-back checkpoint buffers in the journal and release them.
> - * If 'destroy' is set, release all buffers unconditionally.
> + * If 'type' is SHRINK_DESTROY, release all buffers unconditionally. If 'type'
> + * is SHRINK_BUSY_STOP, will stop release buffers if encounters a busy buffer.
> + * To avoid wasting CPU cycles scanning the buffer list in some cases, don't
> + * pass SHRINK_BUSY_SKIP 'type' for this function.
> *
> * Called with j_list_lock held.
> */
> -void __jbd2_journal_clean_checkpoint_list(journal_t *journal, bool destroy)
> +void __jbd2_journal_clean_checkpoint_list(journal_t *journal,
> + enum shrink_type type)
> {
> transaction_t *transaction, *last_transaction, *next_transaction;
> - enum shrink_type type;
> bool released;
>
> + WARN_ON_ONCE(type == SHRINK_BUSY_SKIP);
> +
> transaction = journal->j_checkpoint_transactions;
> if (!transaction)
> return;
>
> - type = destroy ? SHRINK_DESTROY : SHRINK_BUSY_STOP;
> last_transaction = transaction->t_cpprev;
> next_transaction = transaction;
> do {
> @@ -527,7 +529,7 @@ void jbd2_journal_destroy_checkpoint(journal_t *journal)
> spin_unlock(&journal->j_list_lock);
> break;
> }
> - __jbd2_journal_clean_checkpoint_list(journal, true);
> + __jbd2_journal_clean_checkpoint_list(journal, SHRINK_DESTROY);
> spin_unlock(&journal->j_list_lock);
> cond_resched();
> }
> diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
> index 5e122586e06e..78ebd04ac97d 100644
> --- a/fs/jbd2/commit.c
> +++ b/fs/jbd2/commit.c
> @@ -501,7 +501,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
> * frees some memory
> */
> spin_lock(&journal->j_list_lock);
> - __jbd2_journal_clean_checkpoint_list(journal, false);
> + __jbd2_journal_clean_checkpoint_list(journal, SHRINK_BUSY_STOP);
> spin_unlock(&journal->j_list_lock);
>
> jbd2_debug(3, "JBD2: commit phase 1\n");
> diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
> index 971f3e826e15..58a961999d70 100644
> --- a/include/linux/jbd2.h
> +++ b/include/linux/jbd2.h
> @@ -1434,7 +1434,9 @@ void jbd2_update_log_tail(journal_t *journal, tid_t tid, unsigned long block);
> extern void jbd2_journal_commit_transaction(journal_t *);
>
> /* Checkpoint list management */
> -void __jbd2_journal_clean_checkpoint_list(journal_t *journal, bool destroy);
> +enum shrink_type {SHRINK_DESTROY, SHRINK_BUSY_STOP, SHRINK_BUSY_SKIP};
> +
> +void __jbd2_journal_clean_checkpoint_list(journal_t *journal, enum shrink_type type);
> unsigned long jbd2_journal_shrink_checkpoint_list(journal_t *journal, unsigned long *nr_to_scan);
> int __jbd2_journal_remove_checkpoint(struct journal_head *);
> int jbd2_journal_try_remove_checkpoint(struct journal_head *jh);
>