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Revision 9bfffea3524b49d0268d01f8e7967f06c4d0a942 authored by Trond Myklebust on 16 December 2020, 19:01:07 UTC, committed by Trond Myklebust on 16 December 2020, 22:25:24 UTC 
pNFS/flexfiles: Avoid spurious layout returns in ff_layout_choose_ds_for_read
 
The callers of ff_layout_choose_ds_for_read() should decide whether or
not they want to return the layout on error. Sometimes, we may just want
to retry from the beginning.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
1 parent cac1d3a
Raw File
videobuf2-memops.h 
/*
 * videobuf2-memops.h - generic memory handling routines for videobuf2
 *
 * Copyright (C) 2010 Samsung Electronics
 *
 * Author: Pawel Osciak <pawel@osciak.com>
 *	   Marek Szyprowski <m.szyprowski@samsung.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 */

#ifndef _MEDIA_VIDEOBUF2_MEMOPS_H
#define _MEDIA_VIDEOBUF2_MEMOPS_H

#include <media/videobuf2-v4l2.h>
#include <linux/mm.h>
#include <linux/refcount.h>

/**
 * struct vb2_vmarea_handler - common vma refcount tracking handler.
 *
 * @refcount:	pointer to &refcount_t entry in the buffer.
 * @put:	callback to function that decreases buffer refcount.
 * @arg:	argument for @put callback.
 */
struct vb2_vmarea_handler {
	refcount_t		*refcount;
	void			(*put)(void *arg);
	void			*arg;
};

extern const struct vm_operations_struct vb2_common_vm_ops;

struct frame_vector *vb2_create_framevec(unsigned long start,
					 unsigned long length);
void vb2_destroy_framevec(struct frame_vector *vec);

#endif
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