'\" t
.\"     Title: struct dma_buf
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Device drivers infrastructure
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "STRUCT DMA_BUF" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Device drivers infrastructure"
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.SH "NAME"
struct_dma_buf \- shared buffer object
.SH "SYNOPSIS"
.sp
.nf
struct dma_buf {
  size_t size;
  struct file * file;
  struct list_head attachments;
  const struct dma_buf_ops * ops;
  struct mutex lock;
  unsigned vmapping_counter;
  void * vmap_ptr;
  const char * exp_name;
  struct module * owner;
  struct list_head list_node;
  void * priv;
  struct reservation_object * resv;
  wait_queue_head_t poll;
  struct dma_buf_poll_cb_t cb_excl;
  struct dma_buf_poll_cb_t cb_shared;
};  
.fi
.SH "MEMBERS"
.PP
size
.RS 4
size of the buffer
.RE
.PP
file
.RS 4
file pointer used for sharing buffers across, and for refcounting\&.
.RE
.PP
attachments
.RS 4
list of dma_buf_attachment that denotes all devices attached\&.
.RE
.PP
ops
.RS 4
dma_buf_ops associated with this buffer object\&.
.RE
.PP
lock
.RS 4
used internally to serialize list manipulation, attach/detach and vmap/unmap
.RE
.PP
vmapping_counter
.RS 4
used internally to refcnt the vmaps
.RE
.PP
vmap_ptr
.RS 4
the current vmap ptr if vmapping_counter > 0
.RE
.PP
exp_name
.RS 4
name of the exporter; useful for debugging\&.
.RE
.PP
owner
.RS 4
pointer to exporter module; used for refcounting when exporter is a kernel module\&.
.RE
.PP
list_node
.RS 4
node for dma_buf accounting and debugging\&.
.RE
.PP
priv
.RS 4
exporter specific private data for this buffer object\&.
.RE
.PP
resv
.RS 4
reservation object linked to this dma\-buf
.RE
.PP
poll
.RS 4
for userspace poll support
.RE
.PP
cb_excl
.RS 4
for userspace poll support
.RE
.PP
cb_shared
.RS 4
for userspace poll support
.RE
.SH "COPYRIGHT"
.br