author | Florian Westphal <fw@strlen.de> |
Sun, 11 Jan 2009 20:20:11 +0100 | |
changeset 0 | aa628870c1d3 |
permissions | -rw-r--r-- |
0
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Port of Linux 2.6.28 for use with network simulation cradle.
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#ifndef _LINUX_PIPE_FS_I_H |
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#define _LINUX_PIPE_FS_I_H |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
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#define PIPEFS_MAGIC 0x50495045 |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
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#define PIPE_BUFFERS (16) |
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Port of Linux 2.6.28 for use with network simulation cradle.
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|
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#define PIPE_BUF_FLAG_LRU 0x01 /* page is on the LRU */ |
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#define PIPE_BUF_FLAG_ATOMIC 0x02 /* was atomically mapped */ |
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#define PIPE_BUF_FLAG_GIFT 0x04 /* page is a gift */ |
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|
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Port of Linux 2.6.28 for use with network simulation cradle.
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/** |
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* struct pipe_buffer - a linux kernel pipe buffer |
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* @page: the page containing the data for the pipe buffer |
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* @offset: offset of data inside the @page |
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* @len: length of data inside the @page |
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* @ops: operations associated with this buffer. See @pipe_buf_operations. |
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* @flags: pipe buffer flags. See above. |
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* @private: private data owned by the ops. |
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**/ |
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struct pipe_buffer { |
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struct page *page; |
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unsigned int offset, len; |
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const struct pipe_buf_operations *ops; |
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unsigned int flags; |
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unsigned long private; |
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}; |
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|
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/** |
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* struct pipe_inode_info - a linux kernel pipe |
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* @wait: reader/writer wait point in case of empty/full pipe |
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* @nrbufs: the number of non-empty pipe buffers in this pipe |
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* @curbuf: the current pipe buffer entry |
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* @tmp_page: cached released page |
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* @readers: number of current readers of this pipe |
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* @writers: number of current writers of this pipe |
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* @waiting_writers: number of writers blocked waiting for room |
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* @r_counter: reader counter |
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* @w_counter: writer counter |
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* @fasync_readers: reader side fasync |
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* @fasync_writers: writer side fasync |
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* @inode: inode this pipe is attached to |
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* @bufs: the circular array of pipe buffers |
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**/ |
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struct pipe_inode_info { |
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wait_queue_head_t wait; |
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unsigned int nrbufs, curbuf; |
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struct page *tmp_page; |
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unsigned int readers; |
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unsigned int writers; |
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unsigned int waiting_writers; |
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unsigned int r_counter; |
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unsigned int w_counter; |
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struct fasync_struct *fasync_readers; |
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struct fasync_struct *fasync_writers; |
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struct inode *inode; |
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struct pipe_buffer bufs[PIPE_BUFFERS]; |
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}; |
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|
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/* |
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* Note on the nesting of these functions: |
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* |
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* ->confirm() |
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* ->steal() |
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* ... |
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* ->map() |
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* ... |
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* ->unmap() |
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* |
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* That is, ->map() must be called on a confirmed buffer, |
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* same goes for ->steal(). See below for the meaning of each |
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* operation. Also see kerneldoc in fs/pipe.c for the pipe |
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* and generic variants of these hooks. |
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*/ |
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struct pipe_buf_operations { |
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/* |
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* This is set to 1, if the generic pipe read/write may coalesce |
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* data into an existing buffer. If this is set to 0, a new pipe |
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* page segment is always used for new data. |
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*/ |
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int can_merge; |
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|
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/* |
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* ->map() returns a virtual address mapping of the pipe buffer. |
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* The last integer flag reflects whether this should be an atomic |
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* mapping or not. The atomic map is faster, however you can't take |
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* page faults before calling ->unmap() again. So if you need to eg |
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* access user data through copy_to/from_user(), then you must get |
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* a non-atomic map. ->map() uses the KM_USER0 atomic slot for |
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* atomic maps, so you can't map more than one pipe_buffer at once |
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* and you have to be careful if mapping another page as source |
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* or destination for a copy (IOW, it has to use something else |
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* than KM_USER0). |
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*/ |
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void * (*map)(struct pipe_inode_info *, struct pipe_buffer *, int); |
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|
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/* |
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* Undoes ->map(), finishes the virtual mapping of the pipe buffer. |
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*/ |
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void (*unmap)(struct pipe_inode_info *, struct pipe_buffer *, void *); |
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|
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/* |
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* ->confirm() verifies that the data in the pipe buffer is there |
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* and that the contents are good. If the pages in the pipe belong |
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* to a file system, we may need to wait for IO completion in this |
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* hook. Returns 0 for good, or a negative error value in case of |
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* error. |
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*/ |
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int (*confirm)(struct pipe_inode_info *, struct pipe_buffer *); |
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|
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/* |
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* When the contents of this pipe buffer has been completely |
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* consumed by a reader, ->release() is called. |
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*/ |
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void (*release)(struct pipe_inode_info *, struct pipe_buffer *); |
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/* |
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* Attempt to take ownership of the pipe buffer and its contents. |
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* ->steal() returns 0 for success, in which case the contents |
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* of the pipe (the buf->page) is locked and now completely owned |
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* by the caller. The page may then be transferred to a different |
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* mapping, the most often used case is insertion into different |
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* file address space cache. |
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*/ |
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int (*steal)(struct pipe_inode_info *, struct pipe_buffer *); |
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/* |
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* Get a reference to the pipe buffer. |
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*/ |
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void (*get)(struct pipe_inode_info *, struct pipe_buffer *); |
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}; |
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/* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual |
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memory allocation, whereas PIPE_BUF makes atomicity guarantees. */ |
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#define PIPE_SIZE PAGE_SIZE |
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/* Drop the inode semaphore and wait for a pipe event, atomically */ |
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void pipe_wait(struct pipe_inode_info *pipe); |
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struct pipe_inode_info * alloc_pipe_info(struct inode * inode); |
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void free_pipe_info(struct inode * inode); |
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void __free_pipe_info(struct pipe_inode_info *); |
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/* Generic pipe buffer ops functions */ |
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void *generic_pipe_buf_map(struct pipe_inode_info *, struct pipe_buffer *, int); |
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void generic_pipe_buf_unmap(struct pipe_inode_info *, struct pipe_buffer *, void *); |
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void generic_pipe_buf_get(struct pipe_inode_info *, struct pipe_buffer *); |
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int generic_pipe_buf_confirm(struct pipe_inode_info *, struct pipe_buffer *); |
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int generic_pipe_buf_steal(struct pipe_inode_info *, struct pipe_buffer *); |
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#endif |