[2.6.18-rc* PATCH RFC]: Correct ambiguous errno of aio

[Yi Yang <yang.y.yi@gmail.com>]

Sorry, the last post is corrupted by email client, this is a repost.

In the current implementation of AIO, for the operation IOCB_CMD_FDSYNC

and IOCB_CMD_FSYNC, the returned errno is -EINVAL although the kernel

does know them, I think the correct errno should be -EOPNOTSUPP which

means they aren't be implemented or supported.

--- a/fs/aio.c.orig	2006-08-28 15:15:18.000000000 +0800
+++ b/fs/aio.c	2006-08-28 15:33:59.000000000 +0800
@@ -1363,20 +1363,10 @@ static ssize_t aio_pwrite(struct kiocb *
 	return ret;
 }
 
-static ssize_t aio_fdsync(struct kiocb *iocb)
-{
-	struct file *file = iocb->ki_filp;
-	ssize_t ret = -EINVAL;
-
-	if (file->f_op->aio_fsync)
-		ret = file->f_op->aio_fsync(iocb, 1);
-	return ret;
-}
-
 static ssize_t aio_fsync(struct kiocb *iocb)
 {
 	struct file *file = iocb->ki_filp;
-	ssize_t ret = -EINVAL;
+	ssize_t ret = -EOPNOTSUPP;
 
 	if (file->f_op->aio_fsync)
 		ret = file->f_op->aio_fsync(iocb, 0);
@@ -1425,12 +1415,12 @@ static ssize_t aio_setup_iocb(struct kio
 			kiocb->ki_retry = aio_pwrite;
 		break;
 	case IOCB_CMD_FDSYNC:
-		ret = -EINVAL;
+		ret = -EOPNOTSUPP;
 		if (file->f_op->aio_fsync)
-			kiocb->ki_retry = aio_fdsync;
+			kiocb->ki_retry = aio_fsync;
 		break;
 	case IOCB_CMD_FSYNC:
-		ret = -EINVAL;
+		ret = -EOPNOTSUPP;
 		if (file->f_op->aio_fsync)
 			kiocb->ki_retry = aio_fsync;
 		break;