linux/arch/um/drivers/ubd.h

/* SPDX-License-Identifier: GPL-2.0 */
/* 
 * Copyright (C) 2000 Jeff Dike (jdike@karaya.com)
 * Copyright (C) 2001 RidgeRun, Inc (glonnon@ridgerun.com)
 */

#ifndef __UM_UBD_USER_H
#define __UM_UBD_USER_H

#include <os.h>

int start_io_thread(struct os_helper_thread **td_out, int *fd_out);
void *io_thread(void *arg);
extern int kernel_fd;

extern int ubd_read_poll(int timeout);
extern int ubd_write_poll(int timeout);

#define UBD_REQ_BUFFER_SIZE 64

#endif
um: Add SPDX headers for files in arch/um/drivers Convert files to use SPDX header. All files are licensed under the GPLv2. Signed-off-by: Alex Dewar <alex.dewar@gmx.co.uk> Signed-off-by: Richard Weinberger <richard@nod.at> 2019-08-25 10:49:16 +01:00			`/* SPDX-License-Identifier: GPL-2.0 */`
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-16 15:20:36 -07:00			`/*`
			`* Copyright (C) 2000 Jeff Dike (jdike@karaya.com)`
			`* Copyright (C) 2001 RidgeRun, Inc (glonnon@ridgerun.com)`
			`*/`

			`#ifndef __UM_UBD_USER_H`
			`#define __UM_UBD_USER_H`

um: ubd: Switch to the pthread-based helper The ubd io thread and UML kernel thread share the same errno, which can lead to conflicts when both call syscalls concurrently. Switch to the pthread-based helper to address this issue. Signed-off-by: Tiwei Bie <tiwei.btw@antgroup.com> Link: https://patch.msgid.link/20250319135523.97050-3-tiwei.btw@antgroup.com Signed-off-by: Johannes Berg <johannes.berg@intel.com> 2025-03-19 21:55:21 +08:00			`#include <os.h>`

			`int start_io_thread(struct os_helper_thread *td_out, int fd_out);`
			`void io_thread(void arg);`
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-16 15:20:36 -07:00			`extern int kernel_fd;`

um: UBD Improvements UBD at present is extremely slow because it handles only one request at a time in the IO thread and IRQ handler. The single request at a time is replaced by handling multiple requests as well as necessary workarounds for short reads/writes. Resulting performance improvement in disk IO - 30% Signed-off-by: Anton Ivanov <aivanov@kot-begemot.co.uk> Signed-off-by: Richard Weinberger <richard@nod.at> 2016-11-09 20:43:25 +00:00			`extern int ubd_read_poll(int timeout);`
			`extern int ubd_write_poll(int timeout);`

			`#define UBD_REQ_BUFFER_SIZE 64`

Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-16 15:20:36 -07:00			`#endif`