mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-02 12:56:45 +07:00
1da177e4c3
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!
60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
#ifndef _LINUX_PIPE_FS_I_H
|
|
#define _LINUX_PIPE_FS_I_H
|
|
|
|
#define PIPEFS_MAGIC 0x50495045
|
|
|
|
#define PIPE_BUFFERS (16)
|
|
|
|
struct pipe_buffer {
|
|
struct page *page;
|
|
unsigned int offset, len;
|
|
struct pipe_buf_operations *ops;
|
|
};
|
|
|
|
struct pipe_buf_operations {
|
|
int can_merge;
|
|
void * (*map)(struct file *, struct pipe_inode_info *, struct pipe_buffer *);
|
|
void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *);
|
|
void (*release)(struct pipe_inode_info *, struct pipe_buffer *);
|
|
};
|
|
|
|
struct pipe_inode_info {
|
|
wait_queue_head_t wait;
|
|
unsigned int nrbufs, curbuf;
|
|
struct pipe_buffer bufs[PIPE_BUFFERS];
|
|
struct page *tmp_page;
|
|
unsigned int start;
|
|
unsigned int readers;
|
|
unsigned int writers;
|
|
unsigned int waiting_writers;
|
|
unsigned int r_counter;
|
|
unsigned int w_counter;
|
|
struct fasync_struct *fasync_readers;
|
|
struct fasync_struct *fasync_writers;
|
|
};
|
|
|
|
/* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual
|
|
memory allocation, whereas PIPE_BUF makes atomicity guarantees. */
|
|
#define PIPE_SIZE PAGE_SIZE
|
|
|
|
#define PIPE_SEM(inode) (&(inode).i_sem)
|
|
#define PIPE_WAIT(inode) (&(inode).i_pipe->wait)
|
|
#define PIPE_BASE(inode) ((inode).i_pipe->base)
|
|
#define PIPE_START(inode) ((inode).i_pipe->start)
|
|
#define PIPE_LEN(inode) ((inode).i_pipe->len)
|
|
#define PIPE_READERS(inode) ((inode).i_pipe->readers)
|
|
#define PIPE_WRITERS(inode) ((inode).i_pipe->writers)
|
|
#define PIPE_WAITING_WRITERS(inode) ((inode).i_pipe->waiting_writers)
|
|
#define PIPE_RCOUNTER(inode) ((inode).i_pipe->r_counter)
|
|
#define PIPE_WCOUNTER(inode) ((inode).i_pipe->w_counter)
|
|
#define PIPE_FASYNC_READERS(inode) (&((inode).i_pipe->fasync_readers))
|
|
#define PIPE_FASYNC_WRITERS(inode) (&((inode).i_pipe->fasync_writers))
|
|
|
|
/* Drop the inode semaphore and wait for a pipe event, atomically */
|
|
void pipe_wait(struct inode * inode);
|
|
|
|
struct inode* pipe_new(struct inode* inode);
|
|
void free_pipe_info(struct inode* inode);
|
|
|
|
#endif
|