SYNOPSIS

struct pipe_inode_info {
struct mutex mutex;
wait_queue_head_t wait;
unsigned int nrbufs;
unsigned int curbuf;
unsigned int buffers;
unsigned int readers;
unsigned int writers;
unsigned int files;
unsigned int waiting_writers;
unsigned int r_counter;
unsigned int w_counter;
struct page * tmp_page;
struct fasync_struct * fasync_readers;
struct fasync_struct * fasync_writers;
struct pipe_buffer * bufs;
};

MEMBERS

mutex

mutex protecting the whole thing

wait

reader/writer wait point in case of empty/full pipe

nrbufs

the number of non-empty pipe buffers in this pipe

curbuf

the current pipe buffer entry

buffers

total number of buffers (should be a power of 2)

readers

number of current readers of this pipe

writers

number of current writers of this pipe

files

number of struct file refering this pipe (protected by ->i_lock)

waiting_writers

number of writers blocked waiting for room

r_counter

reader counter

w_counter

writer counter

tmp_page

cached released page

fasync_readers

reader side fasync

fasync_writers

writer side fasync

bufs

the circular array of pipe buffers

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