xfs: unwind log item error flagging

When an buffer IO error occurs, we want to mark all
the log items attached to the buffer as failed. Open code
the error handling loop so that we can modify the flagging for the
different types of objects directly and independently of each other.

This also allows us to remove the ->iop_error method from the log
item operations.
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/xfs_buf_item.c

@@ -12,6 +12,7 @@
 #include "xfs_bit.h"
 #include "xfs_mount.h"
 #include "xfs_trans.h"
+#include "xfs_trans_priv.h"
 #include "xfs_buf_item.h"
 #include "xfs_inode.h"
 #include "xfs_inode_item.h"
@@ -955,37 +956,6 @@ xfs_buf_item_relse(
 	xfs_buf_item_free(bip);
 }
 
-/*
- * Invoke the error state callback for each log item affected by the failed I/O.
- *
- * If a metadata buffer write fails with a non-permanent error, the buffer is
- * eventually resubmitted and so the completion callbacks are not run. The error
- * state may need to be propagated to the log items attached to the buffer,
- * however, so the next AIL push of the item knows hot to handle it correctly.
- */
-STATIC void
-xfs_buf_do_callbacks_fail(
-	struct xfs_buf		*bp)
-{
-	struct xfs_ail		*ailp = bp->b_mount->m_ail;
-	struct xfs_log_item	*lip;
-
-	/*
-	 * Buffer log item errors are handled directly by xfs_buf_item_push()
-	 * and xfs_buf_iodone_callback_error, and they have no IO error
-	 * callbacks. Check only for items in b_li_list.
-	 */
-	if (list_empty(&bp->b_li_list))
-		return;
-
-	spin_lock(&ailp->ail_lock);
-	list_for_each_entry(lip, &bp->b_li_list, li_bio_list) {
-		if (lip->li_ops->iop_error)
-			lip->li_ops->iop_error(lip, bp);
-	}
-	spin_unlock(&ailp->ail_lock);
-}
-
 /*
  * Decide if we're going to retry the write after a failure, and prepare
  * the buffer for retrying the write.
@@ -1165,6 +1135,7 @@ xfs_buf_inode_iodone(
 	struct xfs_buf		*bp)
 {
 	if (bp->b_error) {
+		struct xfs_log_item *lip;
 		int ret = xfs_buf_iodone_error(bp);
 
 		if (ret == XBF_IOERROR_FINISH)
@@ -1172,7 +1143,11 @@ xfs_buf_inode_iodone(
 		if (ret == XBF_IOERROR_DONE)
 			return;
 		ASSERT(ret == XBF_IOERROR_FAIL);
-		xfs_buf_do_callbacks_fail(bp);
+		spin_lock(&bp->b_mount->m_ail->ail_lock);
+		list_for_each_entry(lip, &bp->b_li_list, li_bio_list) {
+			xfs_set_li_failed(lip, bp);
+		}
+		spin_unlock(&bp->b_mount->m_ail->ail_lock);
 		xfs_buf_ioerror(bp, 0);
 		xfs_buf_relse(bp);
 		return;
@@ -1193,6 +1168,7 @@ xfs_buf_dquot_iodone(
 	struct xfs_buf		*bp)
 {
 	if (bp->b_error) {
+		struct xfs_log_item *lip;
 		int ret = xfs_buf_iodone_error(bp);
 
 		if (ret == XBF_IOERROR_FINISH)
@@ -1200,7 +1176,11 @@ xfs_buf_dquot_iodone(
 		if (ret == XBF_IOERROR_DONE)
 			return;
 		ASSERT(ret == XBF_IOERROR_FAIL);
-		xfs_buf_do_callbacks_fail(bp);
+		spin_lock(&bp->b_mount->m_ail->ail_lock);
+		list_for_each_entry(lip, &bp->b_li_list, li_bio_list) {
+			xfs_set_li_failed(lip, bp);
+		}
+		spin_unlock(&bp->b_mount->m_ail->ail_lock);
 		xfs_buf_ioerror(bp, 0);
 		xfs_buf_relse(bp);
 		return;
@@ -1232,7 +1212,7 @@ xfs_buf_iodone(
 		if (ret == XBF_IOERROR_DONE)
 			return;
 		ASSERT(ret == XBF_IOERROR_FAIL);
-		xfs_buf_do_callbacks_fail(bp);
+		ASSERT(list_empty(&bp->b_li_list));
 		xfs_buf_ioerror(bp, 0);
 		xfs_buf_relse(bp);
 		return;

fs/xfs/xfs_dquot_item.c

@@ -113,23 +113,6 @@ xfs_qm_dqunpin_wait(
 	wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
 }
 
-/*
- * Callback used to mark a buffer with XFS_LI_FAILED when items in the buffer
- * have been failed during writeback
- *
- * this informs the AIL that the dquot is already flush locked on the next push,
- * and acquires a hold on the buffer to ensure that it isn't reclaimed before
- * dirty data makes it to disk.
- */
-STATIC void
-xfs_dquot_item_error(
-	struct xfs_log_item	*lip,
-	struct xfs_buf		*bp)
-{
-	ASSERT(!completion_done(&DQUOT_ITEM(lip)->qli_dquot->q_flush));
-	xfs_set_li_failed(lip, bp);
-}
-
 STATIC uint
 xfs_qm_dquot_logitem_push(
 	struct xfs_log_item	*lip,
@@ -216,7 +199,6 @@ static const struct xfs_item_ops xfs_dquot_item_ops = {
 	.iop_release	= xfs_qm_dquot_logitem_release,
 	.iop_committing	= xfs_qm_dquot_logitem_committing,
 	.iop_push	= xfs_qm_dquot_logitem_push,
-	.iop_error	= xfs_dquot_item_error
 };
 
 /*

fs/xfs/xfs_inode_item.c

@@ -464,23 +464,6 @@ xfs_inode_item_unpin(
 		wake_up_bit(&ip->i_flags, __XFS_IPINNED_BIT);
 }
 
-/*
- * Callback used to mark a buffer with XFS_LI_FAILED when items in the buffer
- * have been failed during writeback
- *
- * This informs the AIL that the inode is already flush locked on the next push,
- * and acquires a hold on the buffer to ensure that it isn't reclaimed before
- * dirty data makes it to disk.
- */
-STATIC void
-xfs_inode_item_error(
-	struct xfs_log_item	*lip,
-	struct xfs_buf		*bp)
-{
-	ASSERT(xfs_isiflocked(INODE_ITEM(lip)->ili_inode));
-	xfs_set_li_failed(lip, bp);
-}
-
 STATIC uint
 xfs_inode_item_push(
 	struct xfs_log_item	*lip,
@@ -619,7 +602,6 @@ static const struct xfs_item_ops xfs_inode_item_ops = {
 	.iop_committed	= xfs_inode_item_committed,
 	.iop_push	= xfs_inode_item_push,
 	.iop_committing	= xfs_inode_item_committing,
-	.iop_error	= xfs_inode_item_error
 };
 
 

fs/xfs/xfs_trans.h

@@ -74,7 +74,6 @@ struct xfs_item_ops {
 	void (*iop_committing)(struct xfs_log_item *, xfs_lsn_t commit_lsn);
 	void (*iop_release)(struct xfs_log_item *);
 	xfs_lsn_t (*iop_committed)(struct xfs_log_item *, xfs_lsn_t);
-	void (*iop_error)(struct xfs_log_item *, xfs_buf_t *);
 	int (*iop_recover)(struct xfs_log_item *lip, struct xfs_trans *tp);
 	bool (*iop_match)(struct xfs_log_item *item, uint64_t id);
 };