iomap: update ki_pos a little later in iomap_dio_complete

Move the ki_pos update down a bit to prepare for a better common helper
that invalidates pages based of an iocb.

Link: https://lkml.kernel.org/r/20230601145904.1385409-3-hch@lst.deSigned-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Anna Schumaker <anna@kernel.org>
Cc: Chao Yu <chao@kernel.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

fs/iomap/direct-io.c

@@ -94,7 +94,6 @@ ssize_t iomap_dio_complete(struct iomap_dio *dio)
 		if (offset + ret > dio->i_size &&
 		    !(dio->flags & IOMAP_DIO_WRITE))
 			ret = dio->i_size - offset;
-		iocb->ki_pos += ret;
 	}
 
 	/*
@@ -120,19 +119,21 @@ ssize_t iomap_dio_complete(struct iomap_dio *dio)
 	}
 
 	inode_dio_end(file_inode(iocb->ki_filp));
+
+	if (ret > 0) {
+		iocb->ki_pos += ret;
+
 		/*
-	 * If this is a DSYNC write, make sure we push it to stable storage now
-	 * that we've written data.
+		 * If this is a DSYNC write, make sure we push it to stable
+		 * storage now that we've written data.
 		 */
-	if (ret > 0 && (dio->flags & IOMAP_DIO_NEED_SYNC))
+		if (dio->flags & IOMAP_DIO_NEED_SYNC)
 			ret = generic_write_sync(iocb, ret);
-
 		if (ret > 0)
 			ret += dio->done_before;
-
+	}
 	trace_iomap_dio_complete(iocb, dio->error, ret);
 	kfree(dio);
-
 	return ret;
 }
 EXPORT_SYMBOL_GPL(iomap_dio_complete);