Re: [PATCH 6/8] xfs: factor common AIL item deletion code

Allison Collins
2020-03-25T04:54:42Z

On 3/24/20 6:42 PM, Dave Chinner wrote:
> From: Dave Chinner <dchinner@redhat.com>
>
> Factor the common AIL deletion code that does all the wakeups into a
> helper so we only have one copy of this somewhat tricky code to
> interface with all the wakeups necessary when the LSN of the log
> tail changes.
>
> Signed-off-by: Dave Chinner <dchinner@redhat.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
Ok, the hoisted code looks equivalent
Reviewed-by: Allison Collins <allison.henderson@oracle.com>

> ---
> fs/xfs/xfs_inode_item.c | 12 +----------
> fs/xfs/xfs_trans_ail.c | 48 ++++++++++++++++++++++-------------------
> fs/xfs/xfs_trans_priv.h | 4 +++-
> 3 files changed, 30 insertions(+), 34 deletions(-)
>
> diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
> index 4a3d13d4a0228..bd8c368098707 100644
> --- a/fs/xfs/xfs_inode_item.c
> +++ b/fs/xfs/xfs_inode_item.c
> @@ -742,17 +742,7 @@ xfs_iflush_done(
> xfs_clear_li_failed(blip);
> }
> }
> -
> - if (mlip_changed) {
> - if (!XFS_FORCED_SHUTDOWN(ailp->ail_mount))
> - xlog_assign_tail_lsn_locked(ailp->ail_mount);
> - if (list_empty(&ailp->ail_head))
> - wake_up_all(&ailp->ail_empty);
> - }
> - spin_unlock(&ailp->ail_lock);
> -
> - if (mlip_changed)
> - xfs_log_space_wake(ailp->ail_mount);
> + xfs_ail_update_finish(ailp, mlip_changed);
> }
>
> /*
> diff --git a/fs/xfs/xfs_trans_ail.c b/fs/xfs/xfs_trans_ail.c
> index 2ef0dfbfb303d..26d2e7928121c 100644
> --- a/fs/xfs/xfs_trans_ail.c
> +++ b/fs/xfs/xfs_trans_ail.c
> @@ -681,6 +681,27 @@ xfs_ail_push_all_sync(
> finish_wait(&ailp->ail_empty, &wait);
> }
>
> +void
> +xfs_ail_update_finish(
> + struct xfs_ail *ailp,
> + bool do_tail_update) __releases(ailp->ail_lock)
> +{
> + struct xfs_mount *mp = ailp->ail_mount;
> +
> + if (!do_tail_update) {
> + spin_unlock(&ailp->ail_lock);
> + return;
> + }
> +
> + if (!XFS_FORCED_SHUTDOWN(mp))
> + xlog_assign_tail_lsn_locked(mp);
> +
> + if (list_empty(&ailp->ail_head))
> + wake_up_all(&ailp->ail_empty);
> + spin_unlock(&ailp->ail_lock);
> + xfs_log_space_wake(mp);
> +}
> +
> /*
> * xfs_trans_ail_update - bulk AIL insertion operation.
> *
> @@ -740,15 +761,7 @@ xfs_trans_ail_update_bulk(
> if (!list_empty(&tmp))
> xfs_ail_splice(ailp, cur, &tmp, lsn);
>
> - if (mlip_changed) {
> - if (!XFS_FORCED_SHUTDOWN(ailp->ail_mount))
> - xlog_assign_tail_lsn_locked(ailp->ail_mount);
> - spin_unlock(&ailp->ail_lock);
> -
> - xfs_log_space_wake(ailp->ail_mount);
> - } else {
> - spin_unlock(&ailp->ail_lock);
> - }
> + xfs_ail_update_finish(ailp, mlip_changed);
> }
>
> bool
> @@ -792,10 +805,10 @@ void
> xfs_trans_ail_delete(
> struct xfs_ail *ailp,
> struct xfs_log_item *lip,
> - int shutdown_type) __releases(ailp->ail_lock)
> + int shutdown_type)
> {
> struct xfs_mount *mp = ailp->ail_mount;
> - bool mlip_changed;
> + bool need_update;
>
> if (!test_bit(XFS_LI_IN_AIL, &lip->li_flags)) {
> spin_unlock(&ailp->ail_lock);
> @@ -808,17 +821,8 @@ xfs_trans_ail_delete(
> return;
> }
>
> - mlip_changed = xfs_ail_delete_one(ailp, lip);
> - if (mlip_changed) {
> - if (!XFS_FORCED_SHUTDOWN(mp))
> - xlog_assign_tail_lsn_locked(mp);
> - if (list_empty(&ailp->ail_head))
> - wake_up_all(&ailp->ail_empty);
> - }
> -
> - spin_unlock(&ailp->ail_lock);
> - if (mlip_changed)
> - xfs_log_space_wake(ailp->ail_mount);
> + need_update = xfs_ail_delete_one(ailp, lip);
> + xfs_ail_update_finish(ailp, need_update);
> }
>
> int
> diff --git a/fs/xfs/xfs_trans_priv.h b/fs/xfs/xfs_trans_priv.h
> index 2e073c1c4614f..64ffa746730e4 100644
> --- a/fs/xfs/xfs_trans_priv.h
> +++ b/fs/xfs/xfs_trans_priv.h
> @@ -92,8 +92,10 @@ xfs_trans_ail_update(
> }
>
> bool xfs_ail_delete_one(struct xfs_ail *ailp, struct xfs_log_item *lip);
> +void xfs_ail_update_finish(struct xfs_ail *ailp, bool do_tail_update)
> + __releases(ailp->ail_lock);
> void xfs_trans_ail_delete(struct xfs_ail *ailp, struct xfs_log_item *lip,
> - int shutdown_type) __releases(ailp->ail_lock);
> + int shutdown_type);
>
> static inline void
> xfs_trans_ail_remove(
>