xfs: remove unnecessary shutdown check from xfs_iflush()

The shutdown check in xfs_iflush() duplicates checks down in the
buffer code. If the fs is shut down, xfs_trans_read_buf_map() always
returns an error and falls into the same error path. Remove the
unnecessary check along with the warning in xfs_imap_to_bp()
that generates excessive noise in the log if the fs is shut down.
Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-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_inode_buf.c

@@ -172,12 +172,7 @@ xfs_imap_to_bp(
 				   (int)imap->im_len, buf_flags, &bp,
 				   &xfs_inode_buf_ops);
 	if (error) {
-		if (error == -EAGAIN) {
-			ASSERT(buf_flags & XBF_TRYLOCK);
-			return error;
-		}
-		xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.",
-			__func__, error);
+		ASSERT(error != -EAGAIN || (buf_flags & XBF_TRYLOCK));
 		return error;
 	}
 

fs/xfs/xfs_inode.c

@@ -3657,19 +3657,6 @@ xfs_iflush(
 		return 0;
 	}
 
-	/*
-	 * This may have been unpinned because the filesystem is shutting
-	 * down forcibly. If that's the case we must not write this inode
-	 * to disk, because the log record didn't make it to disk.
-	 *
-	 * We also have to remove the log item from the AIL in this case,
-	 * as we wait for an empty AIL as part of the unmount process.
-	 */
-	if (XFS_FORCED_SHUTDOWN(mp)) {
-		error = -EIO;
-		goto abort;
-	}
-
 	/*
 	 * Get the buffer containing the on-disk inode. We are doing a try-lock
 	 * operation here, so we may get an EAGAIN error. In that case, return