xfs: move xfs_buf_iowait out of (__)xfs_buf_submit

There is no good reason to pass a bool argument to wait for a buffer when
the callers that want that can easily just wait themselves.

This means the wait moves out of the extra hold of the buffer, but as the
callers of synchronous buffer I/O need to hold a reference anyway that is
perfectly fine.

Because all async buffer submitters ignore the error return value, and
the synchronous ones catch the error condition through b_error and
xfs_buf_iowait this also means the new xfs_buf_submit doesn't have to
return an error code.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Darrick J. Wong <[email protected]>
Acked-by: Dave Chinner <[email protected]>
Signed-off-by: Carlos Maiolino <[email protected]>

Author: Christoph Hellwig

fs/xfs/xfs_buf.c

@@ -53,14 +53,8 @@ struct kmem_cache *xfs_buf_cache;
  *	  b_lock (trylock due to inversion)
  */
 
-static int __xfs_buf_submit(struct xfs_buf *bp, bool wait);
-
-static inline int
-xfs_buf_submit(
-	struct xfs_buf		*bp)
-{
-	return __xfs_buf_submit(bp, !(bp->b_flags & XBF_ASYNC));
-}
+static void xfs_buf_submit(struct xfs_buf *bp);
+static int xfs_buf_iowait(struct xfs_buf *bp);
 
 static inline bool xfs_buf_is_uncached(struct xfs_buf *bp)
 {
@@ -804,7 +798,10 @@ _xfs_buf_read(
 	bp->b_flags &= ~(XBF_WRITE | XBF_ASYNC | XBF_READ_AHEAD | XBF_DONE);
 	bp->b_flags |= flags & (XBF_READ | XBF_ASYNC | XBF_READ_AHEAD);
 
-	return xfs_buf_submit(bp);
+	xfs_buf_submit(bp);
+	if (flags & XBF_ASYNC)
+		return 0;
+	return xfs_buf_iowait(bp);
 }
 
 /*
@@ -980,8 +977,8 @@ xfs_buf_read_uncached(
 	bp->b_ops = ops;
 
 	xfs_buf_submit(bp);
-	if (bp->b_error) {
-		error = bp->b_error;
+	error = xfs_buf_iowait(bp);
+	if (error) {
 		xfs_buf_relse(bp);
 		return error;
 	}
@@ -1483,7 +1480,8 @@ xfs_bwrite(
 	bp->b_flags &= ~(XBF_ASYNC | XBF_READ | _XBF_DELWRI_Q |
 			 XBF_DONE);
 
-	error = xfs_buf_submit(bp);
+	xfs_buf_submit(bp);
+	error = xfs_buf_iowait(bp);
 	if (error)
 		xfs_force_shutdown(bp->b_mount, SHUTDOWN_META_IO_ERROR);
 	return error;
@@ -1698,13 +1696,10 @@ xfs_buf_iowait(
  * safe to reference the buffer after a call to this function unless the caller
  * holds an additional reference itself.
  */
-static int
-__xfs_buf_submit(
-	struct xfs_buf	*bp,
-	bool		wait)
+static void
+xfs_buf_submit(
+	struct xfs_buf	*bp)
 {
-	int		error = 0;
-
 	trace_xfs_buf_submit(bp, _RET_IP_);
 
 	ASSERT(!(bp->b_flags & _XBF_DELWRI_Q));
@@ -1724,10 +1719,9 @@ __xfs_buf_submit(
 	 * state here rather than mount state to avoid corrupting the log tail
 	 * on shutdown.
 	 */
-	if (bp->b_mount->m_log &&
-	    xlog_is_shutdown(bp->b_mount->m_log)) {
+	if (bp->b_mount->m_log && xlog_is_shutdown(bp->b_mount->m_log)) {
 		xfs_buf_ioend_fail(bp);
-		return -EIO;
+		return;
 	}
 
 	/*
@@ -1765,16 +1759,12 @@ __xfs_buf_submit(
 			xfs_buf_ioend_async(bp);
 	}
 
-	if (wait)
-		error = xfs_buf_iowait(bp);
-
 	/*
 	 * Release the hold that keeps the buffer referenced for the entire
 	 * I/O. Note that if the buffer is async, it is not safe to reference
 	 * after this release.
 	 */
 	xfs_buf_rele(bp);
-	return error;
 }
 
 void *
@@ -2323,7 +2313,7 @@ xfs_buf_delwri_submit_buffers(
 			bp->b_flags |= XBF_ASYNC;
 			xfs_buf_list_del(bp);
 		}
-		__xfs_buf_submit(bp, false);
+		xfs_buf_submit(bp);
 	}
 	blk_finish_plug(&plug);