From fb579e9a6192ca29a1b60cdfe6f596c2a6cdac3d Mon Sep 17 00:00:00 2001
From: Alan Cox <alc@FreeBSD.org>
Date: Sun, 4 Mar 2001 01:22:23 +0000
Subject: [PATCH] Remove the field privatemodes from struct __aiocb_private and
 the related code from aio_read() and aio_write().  This field was intended,
 but never used, to allow a mythical user-level library to make an aio_read()
 or aio_write() behave like an ordinary read() or write(), i.e., a blocking
 I/O operation.

---
 sys/kern/vfs_aio.c | 139 +--------------------------------------------
 sys/sys/aio.h      |  12 ----
 2 files changed, 2 insertions(+), 149 deletions(-)

diff --git a/sys/kern/vfs_aio.c b/sys/kern/vfs_aio.c
index 83352649fca..6caf2531679 100644
--- a/sys/kern/vfs_aio.c
+++ b/sys/kern/vfs_aio.c
@@ -1872,73 +1872,7 @@ aio_read(struct proc *p, struct aio_read_args *uap)
 #ifndef VFS_AIO
 	return ENOSYS;
 #else
-	struct filedesc *fdp;
-	struct file *fp;
-	struct uio auio;
-	struct iovec aiov;
-	unsigned int fd;
-	int cnt;
-	struct aiocb iocb;
-	int error, pmodes;
-
-	pmodes = fuword(&uap->aiocbp->_aiocb_private.privatemodes);
-	if ((pmodes & AIO_PMODE_SYNC) == 0)
-		return aio_aqueue(p, (struct aiocb *)uap->aiocbp, LIO_READ);
-
-	/* Get control block. */
-	if ((error = copyin((caddr_t)uap->aiocbp, (caddr_t)&iocb, sizeof iocb))
-	    != 0)
-		return error;
-
-	/* Get the fd info for process. */
-	fdp = p->p_fd;
-
-	/*
-	 * Range check file descriptor.
-	 */
-	fd = iocb.aio_fildes;
-	if (fd >= fdp->fd_nfiles)
-		return EBADF;
-	fp = fdp->fd_ofiles[fd];
-	if ((fp == NULL) || ((fp->f_flag & FREAD) == 0))
-		return EBADF;
-	if (iocb.aio_offset == -1LL)
-		return EINVAL;
-
-	auio.uio_resid = iocb.aio_nbytes;
-	if (auio.uio_resid < 0)
-		return (EINVAL);
-
-	/*
-	 * Process sync simply -- queue async request.
-	 */
-	if ((iocb._aiocb_private.privatemodes & AIO_PMODE_SYNC) == 0)
-		return aio_aqueue(p, (struct aiocb *)uap->aiocbp, LIO_READ);
-
-	aiov.iov_base = (void *)iocb.aio_buf;
-	aiov.iov_len = iocb.aio_nbytes;
-
-	auio.uio_iov = &aiov;
-	auio.uio_iovcnt = 1;
-	auio.uio_offset = iocb.aio_offset;
-	auio.uio_rw = UIO_READ;
-	auio.uio_segflg = UIO_USERSPACE;
-	auio.uio_procp = p;
-
-	cnt = iocb.aio_nbytes;
-	/*
-	 * Temporarily bump the ref count while reading to avoid the
-	 * descriptor being ripped out from under us.
-	 */
-	fhold(fp);
-	error = fo_read(fp, &auio, fp->f_cred, FOF_OFFSET, p);
-	fdrop(fp, p);
-	if (error && (auio.uio_resid != cnt) && (error == ERESTART || error ==
-	    EINTR || error == EWOULDBLOCK))
-		error = 0;
-	cnt -= auio.uio_resid;
-	p->p_retval[0] = cnt;
-	return error;
+	return aio_aqueue(p, (struct aiocb *)uap->aiocbp, LIO_READ);
 #endif /* VFS_AIO */
 }
 
@@ -1948,76 +1882,7 @@ aio_write(struct proc *p, struct aio_write_args *uap)
 #ifndef VFS_AIO
 	return ENOSYS;
 #else
-	struct filedesc *fdp;
-	struct file *fp;
-	struct uio auio;
-	struct iovec aiov;
-	unsigned int fd;
-	int cnt;
-	struct aiocb iocb;
-	int error;
-	int pmodes;
-
-	/*
-	 * Process sync simply -- queue async request.
-	 */
-	pmodes = fuword(&uap->aiocbp->_aiocb_private.privatemodes);
-	if ((pmodes & AIO_PMODE_SYNC) == 0)
-		return aio_aqueue(p, (struct aiocb *)uap->aiocbp, LIO_WRITE);
-
-	if ((error = copyin((caddr_t)uap->aiocbp, (caddr_t)&iocb, sizeof iocb))
-	    != 0)
-		return error;
-
-	/* Get the fd info for process. */
-	fdp = p->p_fd;
-
-	/*
-	 * Range check file descriptor.
-	 */
-	fd = iocb.aio_fildes;
-	if (fd >= fdp->fd_nfiles)
-		return EBADF;
-	fp = fdp->fd_ofiles[fd];
-	if ((fp == NULL) || ((fp->f_flag & FWRITE) == 0))
-		return EBADF;
-	if (iocb.aio_offset == -1LL)
-		return EINVAL;
-
-	aiov.iov_base = (void *)iocb.aio_buf;
-	aiov.iov_len = iocb.aio_nbytes;
-	auio.uio_iov = &aiov;
-	auio.uio_iovcnt = 1;
-	auio.uio_offset = iocb.aio_offset;
-
-	auio.uio_resid = iocb.aio_nbytes;
-	if (auio.uio_resid < 0)
-		return (EINVAL);
-
-	auio.uio_rw = UIO_WRITE;
-	auio.uio_segflg = UIO_USERSPACE;
-	auio.uio_procp = p;
-
-	cnt = iocb.aio_nbytes;
-	/*
-	 * Temporarily bump the ref count while writing to avoid the
-	 * descriptor being ripped out from under us.
-	 */
-	fhold(fp);
-	error = fo_write(fp, &auio, fp->f_cred, FOF_OFFSET, p);
-	fdrop(fp, p);
-	if (error) {
-		if (auio.uio_resid != cnt) {
-			if (error == ERESTART || error == EINTR || error ==
-			    EWOULDBLOCK)
-				error = 0;
-			if (error == EPIPE)
-				psignal(p, SIGPIPE);
-		}
-	}
-	cnt -= auio.uio_resid;
-	p->p_retval[0] = cnt;
-	return error;
+	return aio_aqueue(p, (struct aiocb *)uap->aiocbp, LIO_WRITE);
 #endif /* VFS_AIO */
 }
 
diff --git a/sys/sys/aio.h b/sys/sys/aio.h
index de1db8ee790..0f215662a15 100644
--- a/sys/sys/aio.h
+++ b/sys/sys/aio.h
@@ -49,17 +49,6 @@
  */
 #define	AIO_LISTIO_MAX		16
 
-/*
- * Private mode bit for aio.
- * (This bit is set by the library routine
- *  to allow the kernel to support sync
- *  or async operations in the future.)
- */
-#define AIO_PMODE_SYNC		0x1
-#define AIO_PMODE_DONE		0x2
-#define AIO_PMODE_SUSPEND	0x4
-#define AIO_PMODE_ACTIVE	0x2357c0de
-
 /*
  * Private members for aiocb -- don't access
  * directly.
@@ -67,7 +56,6 @@
 struct __aiocb_private {
 	long	status;
 	long	error;
-	long	privatemodes;
 	void	*kernelinfo;
 };