#define _LINUX_PIPE_FS_I_H
#define PIPEFS_MAGIC 0x50495045
+
+#define PIPE_BUFFERS (16)
+
+#define PIPE_BUF_FLAG_LRU 0x01 /* page is on the LRU */
+#define PIPE_BUF_FLAG_ATOMIC 0x02 /* was atomically mapped */
+#define PIPE_BUF_FLAG_GIFT 0x04 /* page is a gift */
+
+struct pipe_buffer {
+ struct page *page;
+ unsigned int offset, len;
+ const struct pipe_buf_operations *ops;
+ unsigned int flags;
+};
+
+/*
+ * Note on the nesting of these functions:
+ *
+ * ->pin()
+ * ->steal()
+ * ...
+ * ->map()
+ * ...
+ * ->unmap()
+ *
+ * That is, ->map() must be called on a pinned buffer, same goes for ->steal().
+ */
+struct pipe_buf_operations {
+ int can_merge;
+ void * (*map)(struct pipe_inode_info *, struct pipe_buffer *, int);
+ void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *, void *);
+ int (*pin)(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 {
wait_queue_head_t wait;
- char *base;
- unsigned int len;
- unsigned int start;
+ unsigned int nrbufs, curbuf;
+ struct page *tmp_page;
unsigned int readers;
unsigned int writers;
unsigned int waiting_writers;
unsigned int w_counter;
struct fasync_struct *fasync_readers;
struct fasync_struct *fasync_writers;
+ struct inode *inode;
+ struct pipe_buffer bufs[PIPE_BUFFERS];
};
/* 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))
-
-#define PIPE_EMPTY(inode) (PIPE_LEN(inode) == 0)
-#define PIPE_FULL(inode) (PIPE_LEN(inode) == PIPE_SIZE)
-#define PIPE_FREE(inode) (PIPE_SIZE - PIPE_LEN(inode))
-#define PIPE_END(inode) ((PIPE_START(inode) + PIPE_LEN(inode)) & (PIPE_SIZE-1))
-#define PIPE_MAX_RCHUNK(inode) (PIPE_SIZE - PIPE_START(inode))
-#define PIPE_MAX_WCHUNK(inode) (PIPE_SIZE - PIPE_END(inode))
-
/* 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 pipe_inode_info * alloc_pipe_info(struct inode * inode);
+void free_pipe_info(struct inode * inode);
+void __free_pipe_info(struct pipe_inode_info *);
+
+/* Generic pipe buffer ops functions */
+void *generic_pipe_buf_map(struct pipe_inode_info *, struct pipe_buffer *, int);
+void generic_pipe_buf_unmap(struct pipe_inode_info *, struct pipe_buffer *, void *);
+void generic_pipe_buf_get(struct pipe_inode_info *, struct pipe_buffer *);
+int generic_pipe_buf_pin(struct pipe_inode_info *, struct pipe_buffer *);
+int generic_pipe_buf_steal(struct pipe_inode_info *, struct pipe_buffer *);
+
+/*
+ * 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 */
+#define SPLICE_F_GIFT (0x08) /* pages passed in are a gift */
+
+/*
+ * 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 *);
-struct inode* pipe_new(struct inode* inode);
+extern ssize_t splice_from_pipe(struct pipe_inode_info *, struct file *,
+ loff_t *, size_t, unsigned int,
+ splice_actor *);
#endif