[PATCH] remove kiobufs

This patch from Christoph Hellwig removes the kiobuf/kiovec
infrastructure.

This affects three subsystems:

video-buf.c:

   This patch includes an earlier diff from Gerd which converts
    video-buf.c to use get_user_pages() directly.

   Gerd has acked this patch.

LVM1:

   Is now even more broken.

drivers/mtd/devices/blkmtd.c:

   blkmtd is broken by this change.  I contacted Simon Evans, who
   said "I had done a rewrite of blkmtd anyway and just need to convert
   it to BIO.  Feel free to break it in the 2.5 tree, it will force me
   to finish my code."

Neither EVMS nor LVM2 use kiobufs.  The only remaining breakage
of which I am aware is a proprietary MPEG2 streaming module.  It
could use get_user_pages().

2 files changed, 0 insertions, 89 deletions

diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 71732e1216fc..0760d97cd6f9 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -32,7 +32,6 @@ enum bh_state_bits {
 #define MAX_BUF_PER_PAGE (PAGE_CACHE_SIZE / 512)
 
 struct page;
-struct kiobuf;
 struct buffer_head;
 struct address_space;
 typedef void (bh_end_io_t)(struct buffer_head *bh, int uptodate);
diff --git a/include/linux/iobuf.h b/include/linux/iobuf.h
deleted file mode 100644
index fb147b5c48a7..000000000000
--- a/include/linux/iobuf.h
+++ /dev/null
@@ -1,88 +0,0 @@
-/*
- * iobuf.h
- *
- * Defines the structures used to track abstract kernel-space io buffers.
- *
- */
-
-#ifndef __LINUX_IOBUF_H
-#define __LINUX_IOBUF_H
-
-#include <linux/mm.h>
-#include <linux/init.h>
-#include <linux/wait.h>
-#include <asm/atomic.h>
-
-/*
- * The kiobuf structure describes a physical set of pages reserved
- * locked for IO.  The reference counts on each page will have been
- * incremented, and the flags field will indicate whether or not we have
- * pre-locked all of the pages for IO.
- *
- * kiobufs may be passed in arrays to form a kiovec, but we must
- * preserve the property that no page is present more than once over the
- * entire iovec.
- */
-
-#define KIO_MAX_ATOMIC_IO	512 /* in kb */
-#define KIO_STATIC_PAGES	(KIO_MAX_ATOMIC_IO / (PAGE_SIZE >> 10) + 1)
-#define KIO_MAX_SECTORS		(KIO_MAX_ATOMIC_IO * 2)
-
-/* The main kiobuf struct */
-
-struct kiobuf 
-{
-	int		nr_pages;	/* Pages actually referenced */
-	int		array_len;	/* Space in the allocated lists */
-	int		offset;		/* Offset to start of valid data */
-	int		length;		/* Number of valid bytes of data */
-
-	/* Keep separate track of the physical addresses and page
-	 * structs involved.  If we do IO to a memory-mapped device
-	 * region, there won't necessarily be page structs defined for
-	 * every address. */
-
-	struct page **	maplist;
-
-	unsigned int	locked : 1;	/* If set, pages has been locked */
-	
-	/* Always embed enough struct pages for atomic IO */
-	struct page *	map_array[KIO_STATIC_PAGES];
-	sector_t	blocks[KIO_MAX_SECTORS];
-
-	/* Dynamic state for IO completion: */
-	atomic_t	io_count;	/* IOs still in progress */
-	int		errno;		/* Status of completed IO */
-	void		(*end_io) (struct kiobuf *); /* Completion callback */
-	wait_queue_head_t wait_queue;
-};
-
-
-/* mm/memory.c */
-
-int	map_user_kiobuf(int rw, struct kiobuf *, unsigned long va, size_t len);
-void	unmap_kiobuf(struct kiobuf *iobuf);
-int	lock_kiovec(int nr, struct kiobuf *iovec[], int wait);
-int	unlock_kiovec(int nr, struct kiobuf *iovec[]);
-void	mark_dirty_kiobuf(struct kiobuf *iobuf, int bytes);
-
-/* fs/iobuf.c */
-
-int	end_kio_request(struct kiobuf *, int);
-void	simple_wakeup_kiobuf(struct kiobuf *);
-int	alloc_kiovec(int nr, struct kiobuf **);
-void	free_kiovec(int nr, struct kiobuf **);
-int	expand_kiobuf(struct kiobuf *, int);
-void	kiobuf_wait_for_io(struct kiobuf *);
-extern int alloc_kiobuf_bhs(struct kiobuf *);
-extern void free_kiobuf_bhs(struct kiobuf *);
-
-/* fs/buffer.c */
-
-int	brw_kiovec(int rw, int nr, struct kiobuf *iovec[], 
-		   struct block_device *bdev, sector_t [], int size);
-
-/* fs/bio.c */
-void	ll_rw_kio(int rw, struct kiobuf *kio, struct block_device *bdev, sector_t block);
-
-#endif /* __LINUX_IOBUF_H */