X-Git-Url: http://ftp.safe.ca/?a=blobdiff_plain;f=include%2Flinux%2Fpipe_fs_i.h;h=ea4f7cd7bfd85425c96a1d17faa358a2d7cb509f;hb=bef986502fa398b1785a3979b1aa17cd902d3527;hp=32865004751c7cc375a403d1f68f634daa287ec9;hpb=4f6f0bd2ffa4e31c3524f5e65c84a29b6ab73307;p=safe%2Fjmp%2Flinux-2.6

diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 3286500..ea4f7cd 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -5,18 +5,37 @@
 
 #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;
 	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 file *, struct pipe_inode_info *, struct pipe_buffer *);
-	void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *);
+	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 {
@@ -32,27 +51,26 @@ 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 pipe_inode_info * alloc_pipe_info(struct inode * inode);
+void free_pipe_info(struct inode * inode);
+void __free_pipe_info(struct pipe_inode_info *);
 
-struct inode* pipe_new(struct inode* inode);
-void free_pipe_info(struct inode* inode);
+/* 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
@@ -62,5 +80,24 @@ void free_pipe_info(struct inode* inode);
 #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 *);
+
+extern ssize_t splice_from_pipe(struct pipe_inode_info *, struct file *,
+				loff_t *, size_t, unsigned int,
+				splice_actor *);
 
 #endif