xfs: remove xlog_recover_iodone

The log recovery I/O completion handler does not substancially differ from
the normal one except for the fact that it:

 a) never retries failed writes
 b) can have log items that aren't on the AIL
 c) never has inode/dquot log items attached and thus don't need to
    handle them

Add conditionals for (a) and (b) to the ioend code, while (c) doesn't
need special handling anyway.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/xfs/libxfs/xfs_log_recover.h

@@ -121,7 +121,6 @@ struct xlog_recover {
 void xlog_buf_readahead(struct xlog *log, xfs_daddr_t blkno, uint len,
 		const struct xfs_buf_ops *ops);
 bool xlog_is_buffer_cancelled(struct xlog *log, xfs_daddr_t blkno, uint len);
-void xlog_recover_iodone(struct xfs_buf *bp);
 
 void xlog_recover_release_intent(struct xlog *log, unsigned short intent_type,
 		uint64_t intent_id);

fs/xfs/xfs_buf.c

@@ -1243,6 +1243,15 @@ xfs_buf_ioend_handle_error(
 
 	xfs_buf_ioerror_alert_ratelimited(bp);
 
+	/*
+	 * We're not going to bother about retrying this during recovery.
+	 * One strike!
+	 */
+	if (bp->b_flags & _XBF_LOGRECOVERY) {
+		xfs_force_shutdown(mp, SHUTDOWN_META_IO_ERROR);
+		return false;
+	}
+
 	/*
 	 * Synchronous writes will have callers process the error.
 	 */
@@ -1312,13 +1321,6 @@ xfs_buf_ioend(
 			bp->b_ops->verify_read(bp);
 		if (!bp->b_error)
 			bp->b_flags |= XBF_DONE;
-	} else if (bp->b_flags & _XBF_LOGRECOVERY) {
-		/*
-		 * If this is a log recovery buffer, we aren't doing
-		 * transactional I/O yet so we need to let the log recovery code
-		 * handle I/O completions:
-		 */
-		xlog_recover_iodone(bp);
 	} else {
 		if (!bp->b_error) {
 			bp->b_flags &= ~XBF_WRITE_FAIL;
@@ -1345,9 +1347,11 @@ xfs_buf_ioend(
 			xfs_buf_inode_iodone(bp);
 		else if (bp->b_flags & _XBF_DQUOTS)
 			xfs_buf_dquot_iodone(bp);
+
 	}
 
-	bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_READ_AHEAD);
+	bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_READ_AHEAD |
+			 _XBF_LOGRECOVERY);
 
 	if (bp->b_flags & XBF_ASYNC)
 		xfs_buf_relse(bp);

fs/xfs/xfs_buf_item.c

@@ -966,8 +966,12 @@ xfs_buf_item_done(
 	 * xfs_trans_ail_delete() takes care of these.
 	 *
 	 * Either way, AIL is useless if we're forcing a shutdown.
+	 *
+	 * Note that log recovery writes might have buffer items that are not on
+	 * the AIL even when the file system is not shut down.
 	 */
 	xfs_trans_ail_delete(&bp->b_log_item->bli_item,
+			     (bp->b_flags & _XBF_LOGRECOVERY) ? 0 :
 			     SHUTDOWN_CORRUPT_INCORE);
 	xfs_buf_item_relse(bp);
 }

fs/xfs/xfs_buf_item_recover.c

@@ -414,7 +414,7 @@ xlog_recover_validate_buf_type(
 	 *
 	 * Write verifiers update the metadata LSN from log items attached to
 	 * the buffer. Therefore, initialize a bli purely to carry the LSN to
-	 * the verifier. We'll clean it up in our ->iodone() callback.
+	 * the verifier.
 	 */
 	if (bp->b_ops) {
 		struct xfs_buf_log_item	*bip;

fs/xfs/xfs_log_recover.c

@@ -265,31 +265,6 @@ xlog_header_check_mount(
 	return 0;
 }
 
-void
-xlog_recover_iodone(
-	struct xfs_buf	*bp)
-{
-	if (!bp->b_error) {
-		bp->b_flags |= XBF_DONE;
-	} else if (!XFS_FORCED_SHUTDOWN(bp->b_mount)) {
-		/*
-		 * We're not going to bother about retrying this during
-		 * recovery. One strike!
-		 */
-		xfs_buf_ioerror_alert(bp, __this_address);
-		xfs_force_shutdown(bp->b_mount, SHUTDOWN_META_IO_ERROR);
-	}
-
-	/*
-	 * On v5 supers, a bli could be attached to update the metadata LSN.
-	 * Clean it up.
-	 */
-	if (bp->b_log_item)
-		xfs_buf_item_relse(bp);
-	ASSERT(bp->b_log_item == NULL);
-	bp->b_flags &= ~_XBF_LOGRECOVERY;
-}
-
 /*
  * This routine finds (to an approximation) the first block in the physical
  * log which contains the given cycle.  It uses a binary search algorithm.