diff options
Diffstat (limited to 'include/linux/pipe_fs_i.h')
-rw-r--r-- | include/linux/pipe_fs_i.h | 45 |
1 files changed, 31 insertions, 14 deletions
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h index 75c7f55..0008d4b 100644 --- a/include/linux/pipe_fs_i.h +++ b/include/linux/pipe_fs_i.h @@ -5,11 +5,14 @@ #define PIPE_BUFFERS (16) +#define PIPE_BUF_FLAG_STOLEN 0x01 +#define PIPE_BUF_FLAG_LRU 0x02 + struct pipe_buffer { struct page *page; unsigned int offset, len; struct pipe_buf_operations *ops; - unsigned int stolen; + unsigned int flags; }; struct pipe_buf_operations { @@ -18,6 +21,7 @@ struct pipe_buf_operations { void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *); void (*release)(struct pipe_inode_info *, struct pipe_buffer *); int (*steal)(struct pipe_inode_info *, struct pipe_buffer *); + void (*get)(struct pipe_inode_info *, struct pipe_buffer *); }; struct pipe_inode_info { @@ -33,32 +37,45 @@ struct pipe_inode_info { unsigned int w_counter; struct fasync_struct *fasync_readers; struct fasync_struct *fasync_writers; + struct inode *inode; }; /* 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_MUTEX(inode) (&(inode).i_mutex) -#define PIPE_WAIT(inode) (&(inode).i_pipe->wait) -#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); +void pipe_wait(struct pipe_inode_info *pipe); -struct inode* pipe_new(struct inode* inode); -void free_pipe_info(struct inode* inode); +struct pipe_inode_info * alloc_pipe_info(struct inode * inode); +void free_pipe_info(struct inode * inode); +void __free_pipe_info(struct pipe_inode_info *); /* * splice is tied to pipes as a transport (at least for now), so we'll just * add the splice flags here. */ #define SPLICE_F_MOVE (0x01) /* move pages instead of copying */ +#define SPLICE_F_NONBLOCK (0x02) /* don't block on the pipe splicing (but */ + /* we may still block on the fd we splice */ + /* from/to, of course */ +#define SPLICE_F_MORE (0x04) /* expect more data */ + +/* + * Passed to the actors + */ +struct splice_desc { + unsigned int len, total_len; /* current and remaining length */ + unsigned int flags; /* splice flags */ + struct file *file; /* file to read/write */ + loff_t pos; /* file position */ +}; + +typedef int (splice_actor)(struct pipe_inode_info *, struct pipe_buffer *, + struct splice_desc *); + +extern ssize_t splice_from_pipe(struct pipe_inode_info *, struct file *, + loff_t *, size_t, unsigned int, + splice_actor *); #endif |