[PATCH 22/34] xfs: use AIL bulk delete function to implement single delete

Dave Chinner
2010-12-21T07:28:21Z

We now have two copies of AIL delete operations that are mostly
duplicate functionality. The single log item deletes can be
implemented via the bulk updates by turning xfs_trans_ail_delete()
into a simple wrapper. This removes all the duplicate delete
functionality and associated helpers.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
fs/xfs/xfs_trans_ail.c | 65 -----------------------------------------------
fs/xfs/xfs_trans_priv.h | 18 ++++++++-----
2 files changed, 11 insertions(+), 72 deletions(-)

diff --git a/fs/xfs/xfs_trans_ail.c b/fs/xfs/xfs_trans_ail.c
index 8481a5a..c5bbbc4 100644
--- a/fs/xfs/xfs_trans_ail.c
+++ b/fs/xfs/xfs_trans_ail.c
@@ -523,70 +523,6 @@ xfs_trans_ail_update_bulk(
}

/*
- * Delete the given item from the AIL. It must already be in
- * the AIL.
- *
- * Wakeup anyone with an lsn less than item's lsn. If the item
- * we delete in the AIL is the minimum one, update the tail lsn in the
- * log manager.
- *
- * Clear the IN_AIL flag from the item, reset its lsn to 0, and
- * bump the AIL's generation count to indicate that the tree
- * has changed.
- *
- * This function must be called with the AIL lock held. The lock
- * is dropped before returning.
- */
-void
-xfs_trans_ail_delete(
- struct xfs_ail *ailp,
- xfs_log_item_t *lip) __releases(ailp->xa_lock)
-{
- xfs_log_item_t *mlip;
- xfs_lsn_t tail_lsn;
-
- if (lip->li_flags & XFS_LI_IN_AIL) {
- mlip = xfs_ail_min(ailp);
- xfs_ail_delete(ailp, lip);
-
-
- lip->li_flags &= ~XFS_LI_IN_AIL;
- lip->li_lsn = 0;
-
- if (mlip == lip) {
- mlip = xfs_ail_min(ailp);
- /*
- * It is not safe to access mlip after the AIL lock
- * is dropped, so we must get a copy of li_lsn
- * before we do so. This is especially important
- * on 32-bit platforms where accessing and updating
- * 64-bit values like li_lsn is not atomic.
- */
- tail_lsn = mlip ? mlip->li_lsn : 0;
- spin_unlock(&ailp->xa_lock);
- xfs_log_move_tail(ailp->xa_mount, tail_lsn);
- } else {
- spin_unlock(&ailp->xa_lock);
- }
- }
- else {
- /*
- * If the file system is not being shutdown, we are in
- * serious trouble if we get to this stage.
- */
- struct xfs_mount *mp = ailp->xa_mount;
-
- spin_unlock(&ailp->xa_lock);
- if (!XFS_FORCED_SHUTDOWN(mp)) {
- xfs_cmn_err(XFS_PTAG_AILDELETE, CE_ALERT, mp,
- "%s: attempting to delete a log item that is not in the AIL",
- __func__);
- xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
- }
- }
-}
-
-/*
* xfs_trans_ail_delete_bulk - remove multiple log items from the AIL
*
* @xfs_trans_ail_delete_bulk takes an array of log items that all need to
@@ -660,7 +596,6 @@ xfs_trans_ail_delete_bulk(
xfs_log_move_tail(ailp->xa_mount, tail_lsn);
}

-
/*
* The active item list (AIL) is a doubly linked list of log
* items sorted by ascending lsn. The base of the list is
diff --git a/fs/xfs/xfs_trans_priv.h b/fs/xfs/xfs_trans_priv.h
index f469205..35162c2 100644
--- a/fs/xfs/xfs_trans_priv.h
+++ b/fs/xfs/xfs_trans_priv.h
@@ -87,13 +87,17 @@ xfs_trans_ail_update(
xfs_trans_ail_update_bulk(ailp, &lip, 1, lsn);
}

-void xfs_trans_ail_delete(struct xfs_ail *ailp,
- struct xfs_log_item *lip)
- __releases(ailp->xa_lock);
-void xfs_trans_ail_delete_bulk(struct xfs_ail *ailp,
- struct xfs_log_item **log_items,
- int nr_items)
- __releases(ailp->xa_lock);
+void xfs_trans_ail_delete_bulk(struct xfs_ail *ailp,
+ struct xfs_log_item **log_items, int nr_items)
+ __releases(ailp->xa_lock);
+static inline void
+xfs_trans_ail_delete(
+ struct xfs_ail *ailp,
+ xfs_log_item_t *lip) __releases(ailp->xa_lock)
+{
+ xfs_trans_ail_delete_bulk(ailp, &lip, 1);
+}
+
void xfs_trans_ail_push(struct xfs_ail *, xfs_lsn_t);
void xfs_trans_unlocked_item(struct xfs_ail *,
xfs_log_item_t *);