diff --git a/arch/um/drivers/Makefile b/arch/um/drivers/Makefile
index de17d4c6e02d..783e18cae090 100644
--- a/arch/um/drivers/Makefile
+++ b/arch/um/drivers/Makefile
@@ -13,7 +13,7 @@ mcast-objs := mcast_kern.o mcast_user.o
 net-objs := net_kern.o net_user.o
 mconsole-objs := mconsole_kern.o mconsole_user.o
 hostaudio-objs := hostaudio_kern.o
-ubd-objs := ubd_kern.o ubd_user.o
+ubd-objs := ubd_kern.o
 port-objs := port_kern.o port_user.o
 harddog-objs := harddog_kern.o harddog_user.o
 
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index f73134333f64..e77a38da4350 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -35,6 +35,7 @@
 #include "linux/blkpg.h"
 #include "linux/genhd.h"
 #include "linux/spinlock.h"
+#include "asm/atomic.h"
 #include "asm/segment.h"
 #include "asm/uaccess.h"
 #include "asm/irq.h"
@@ -53,20 +54,21 @@
 #include "mem.h"
 #include "mem_kern.h"
 #include "cow.h"
+#include "aio.h"
 
 enum ubd_req { UBD_READ, UBD_WRITE };
 
 struct io_thread_req {
-	enum ubd_req op;
+	enum aio_type op;
 	int fds[2];
 	unsigned long offsets[2];
 	unsigned long long offset;
 	unsigned long length;
 	char *buffer;
 	int sectorsize;
-	unsigned long sector_mask;
-	unsigned long long cow_offset;
-	unsigned long bitmap_words[2];
+	int bitmap_offset;
+	long bitmap_start;
+	long bitmap_end;
 	int error;
 };
 
@@ -80,28 +82,31 @@ extern int create_cow_file(char *cow_file, char *backing_file,
 			   unsigned long *bitmap_len_out,
 			   int *data_offset_out);
 extern int read_cow_bitmap(int fd, void *buf, int offset, int len);
-extern void do_io(struct io_thread_req *req);
+extern void do_io(struct io_thread_req *req, struct request *r,
+		  unsigned long *bitmap);
 
-static inline int ubd_test_bit(__u64 bit, unsigned char *data)
+static inline int ubd_test_bit(__u64 bit, void *data)
 {
+	unsigned char *buffer = data;
 	__u64 n;
 	int bits, off;
 
-	bits = sizeof(data[0]) * 8;
+	bits = sizeof(buffer[0]) * 8;
 	n = bit / bits;
 	off = bit % bits;
-	return((data[n] & (1 << off)) != 0);
+	return((buffer[n] & (1 << off)) != 0);
 }
 
-static inline void ubd_set_bit(__u64 bit, unsigned char *data)
+static inline void ubd_set_bit(__u64 bit, void *data)
 {
+	unsigned char *buffer = data;
 	__u64 n;
 	int bits, off;
 
-	bits = sizeof(data[0]) * 8;
+	bits = sizeof(buffer[0]) * 8;
 	n = bit / bits;
 	off = bit % bits;
-	data[n] |= (1 << off);
+	buffer[n] |= (1 << off);
 }
 /*End stuff from ubd_user.h*/
 
@@ -110,8 +115,6 @@ static inline void ubd_set_bit(__u64 bit, unsigned char *data)
 static DEFINE_SPINLOCK(ubd_io_lock);
 static DEFINE_SPINLOCK(ubd_lock);
 
-static void (*do_ubd)(void);
-
 static int ubd_open(struct inode * inode, struct file * filp);
 static int ubd_release(struct inode * inode, struct file * file);
 static int ubd_ioctl(struct inode * inode, struct file * file,
@@ -158,6 +161,8 @@ struct cow {
         int data_offset;
 };
 
+#define MAX_SG 64
+
 struct ubd {
 	char *file;
 	int count;
@@ -168,6 +173,7 @@ struct ubd {
 	int no_cow;
 	struct cow cow;
 	struct platform_device pdev;
+        struct scatterlist sg[MAX_SG];
 };
 
 #define DEFAULT_COW { \
@@ -460,81 +466,114 @@ __uml_help(fakehd,
 );
 
 static void do_ubd_request(request_queue_t * q);
-
-/* Only changed by ubd_init, which is an initcall. */
-int thread_fd = -1;
+static int in_ubd;
 
 /* Changed by ubd_handler, which is serialized because interrupts only
  * happen on CPU 0.
  */
 int intr_count = 0;
 
+static void ubd_end_request(struct request *req, int bytes, int uptodate)
+{
+	if (!end_that_request_first(req, uptodate, bytes >> 9)) {
+		add_disk_randomness(req->rq_disk);
+		end_that_request_last(req);
+	}
+}
+
 /* call ubd_finish if you need to serialize */
-static void __ubd_finish(struct request *req, int error)
+static void __ubd_finish(struct request *req, int bytes)
 {
-	int nsect;
+	if(bytes < 0){
+		ubd_end_request(req, 0, 0);
+  		return;
+  	}
 
-	if(error){
-		end_request(req, 0);
-		return;
-	}
-	nsect = req->current_nr_sectors;
-	req->sector += nsect;
-	req->buffer += nsect << 9;
-	req->errors = 0;
-	req->nr_sectors -= nsect;
-	req->current_nr_sectors = 0;
-	end_request(req, 1);
+	ubd_end_request(req, bytes, 1);
 }
 
-static inline void ubd_finish(struct request *req, int error)
+static inline void ubd_finish(struct request *req, int bytes)
 {
- 	spin_lock(&ubd_io_lock);
-	__ubd_finish(req, error);
-	spin_unlock(&ubd_io_lock);
+   	spin_lock(&ubd_io_lock);
+	__ubd_finish(req, bytes);
+  	spin_unlock(&ubd_io_lock);
 }
 
-/* Called without ubd_io_lock held */
-static void ubd_handler(void)
-{
-	struct io_thread_req req;
-	struct request *rq = elv_next_request(ubd_queue);
-	int n;
+struct bitmap_io {
+        atomic_t count;
+        struct aio_context aio;
+};
 
-	do_ubd = NULL;
-	intr_count++;
-	n = os_read_file(thread_fd, &req, sizeof(req));
-	if(n != sizeof(req)){
-		printk(KERN_ERR "Pid %d - spurious interrupt in ubd_handler, "
-		       "err = %d\n", os_getpid(), -n);
-		spin_lock(&ubd_io_lock);
-		end_request(rq, 0);
-		spin_unlock(&ubd_io_lock);
-		return;
-	}
-        
-	ubd_finish(rq, req.error);
-	reactivate_fd(thread_fd, UBD_IRQ);	
-	do_ubd_request(ubd_queue);
-}
+struct ubd_aio {
+        struct aio_context aio;
+        struct request *req;
+        int len;
+        struct bitmap_io *bitmap;
+        void *bitmap_buf;
+};
+
+static int ubd_reply_fd = -1;
 
 static irqreturn_t ubd_intr(int irq, void *dev, struct pt_regs *unused)
 {
-	ubd_handler();
+	struct aio_thread_reply reply;
+	struct ubd_aio *aio;
+	struct request *req;
+	int err, n, fd = (int) (long) dev;
+
+	while(1){
+		err = os_read_file(fd, &reply, sizeof(reply));
+		if(err == -EAGAIN)
+			break;
+		if(err < 0){
+			printk("ubd_aio_handler - read returned err %d\n",
+			       -err);
+			break;
+		}
+
+                aio = container_of(reply.data, struct ubd_aio, aio);
+                n = reply.err;
+
+		if(n == 0){
+			req = aio->req;
+			req->nr_sectors -= aio->len >> 9;
+
+			if((aio->bitmap != NULL) &&
+			   (atomic_dec_and_test(&aio->bitmap->count))){
+                                aio->aio = aio->bitmap->aio;
+                                aio->len = 0;
+                                kfree(aio->bitmap);
+                                aio->bitmap = NULL;
+                                submit_aio(&aio->aio);
+			}
+			else {
+				if((req->nr_sectors == 0) &&
+                                   (aio->bitmap == NULL)){
+					int len = req->hard_nr_sectors << 9;
+					ubd_finish(req, len);
+				}
+
+                                if(aio->bitmap_buf != NULL)
+                                        kfree(aio->bitmap_buf);
+				kfree(aio);
+			}
+		}
+                else if(n < 0){
+                        ubd_finish(aio->req, n);
+                        if(aio->bitmap != NULL)
+                                kfree(aio->bitmap);
+                        if(aio->bitmap_buf != NULL)
+                                kfree(aio->bitmap_buf);
+                        kfree(aio);
+                }
+	}
+	reactivate_fd(fd, UBD_IRQ);
+
+        do_ubd_request(ubd_queue);
+
 	return(IRQ_HANDLED);
 }
 
-/* Only changed by ubd_init, which is an initcall. */
-static int io_pid = -1;
-
-void kill_io_thread(void)
-{
-	if(io_pid != -1) 
-		os_kill_process(io_pid, 1);
-}
-
-__uml_exitcall(kill_io_thread);
-
 static int ubd_file_size(struct ubd *dev, __u64 *size_out)
 {
 	char *file;
@@ -569,7 +608,7 @@ static int ubd_open_dev(struct ubd *dev)
 				&dev->cow.data_offset, create_ptr);
 
 	if((dev->fd == -ENOENT) && create_cow){
-		dev->fd = create_cow_file(dev->file, dev->cow.file, 
+		dev->fd = create_cow_file(dev->file, dev->cow.file,
 					  dev->openflags, 1 << 9, PAGE_SIZE,
 					  &dev->cow.bitmap_offset, 
 					  &dev->cow.bitmap_len,
@@ -831,6 +870,10 @@ int ubd_init(void)
 {
         int i;
 
+	ubd_reply_fd = init_aio_irq(UBD_IRQ, "ubd", ubd_intr);
+	if(ubd_reply_fd < 0)
+		printk("Setting up ubd AIO failed, err = %d\n", ubd_reply_fd);
+
 	devfs_mk_dir("ubd");
 	if (register_blkdev(MAJOR_NR, "ubd"))
 		return -1;
@@ -841,6 +884,7 @@ int ubd_init(void)
 		return -1;
 	}
 		
+	blk_queue_max_hw_segments(ubd_queue, MAX_SG);
 	if (fake_major != MAJOR_NR) {
 		char name[sizeof("ubd_nnn\0")];
 
@@ -852,40 +896,12 @@ int ubd_init(void)
 	driver_register(&ubd_driver);
 	for (i = 0; i < MAX_DEV; i++) 
 		ubd_add(i);
+
 	return 0;
 }
 
 late_initcall(ubd_init);
 
-int ubd_driver_init(void){
-	unsigned long stack;
-	int err;
-
-	/* Set by CONFIG_BLK_DEV_UBD_SYNC or ubd=sync.*/
-	if(global_openflags.s){
-		printk(KERN_INFO "ubd: Synchronous mode\n");
-		/* Letting ubd=sync be like using ubd#s= instead of ubd#= is
-		 * enough. So use anyway the io thread. */
-	}
-	stack = alloc_stack(0, 0);
-	io_pid = start_io_thread(stack + PAGE_SIZE - sizeof(void *), 
-				 &thread_fd);
-	if(io_pid < 0){
-		printk(KERN_ERR 
-		       "ubd : Failed to start I/O thread (errno = %d) - "
-		       "falling back to synchronous I/O\n", -io_pid);
-		io_pid = -1;
-		return(0);
-	}
-	err = um_request_irq(UBD_IRQ, thread_fd, IRQ_READ, ubd_intr, 
-			     SA_INTERRUPT, "ubd", ubd_dev);
-	if(err != 0)
-		printk(KERN_ERR "um_request_irq failed - errno = %d\n", -err);
-	return(err);
-}
-
-device_initcall(ubd_driver_init);
-
 static int ubd_open(struct inode *inode, struct file *filp)
 {
 	struct gendisk *disk = inode->i_bdev->bd_disk;
@@ -923,105 +939,55 @@ static int ubd_release(struct inode * inode, struct file * file)
 	return(0);
 }
 
-static void cowify_bitmap(__u64 io_offset, int length, unsigned long *cow_mask,
-			  __u64 *cow_offset, unsigned long *bitmap,
-			  __u64 bitmap_offset, unsigned long *bitmap_words,
-			  __u64 bitmap_len)
+static void cowify_bitmap(struct io_thread_req *req, unsigned long *bitmap)
 {
-	__u64 sector = io_offset >> 9;
-	int i, update_bitmap = 0;
+        __u64 sector = req->offset / req->sectorsize;
+        int i;
 
-	for(i = 0; i < length >> 9; i++){
-		if(cow_mask != NULL)
-			ubd_set_bit(i, (unsigned char *) cow_mask);
-		if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
-			continue;
+        for(i = 0; i < req->length / req->sectorsize; i++){
+                if(ubd_test_bit(sector + i, bitmap))
+                        continue;
 
-		update_bitmap = 1;
-		ubd_set_bit(sector + i, (unsigned char *) bitmap);
-	}
+                if(req->bitmap_start == -1)
+                        req->bitmap_start = sector + i;
+                req->bitmap_end = sector + i + 1;
 
-	if(!update_bitmap)
-		return;
-
-	*cow_offset = sector / (sizeof(unsigned long) * 8);
-
-	/* This takes care of the case where we're exactly at the end of the
-	 * device, and *cow_offset + 1 is off the end.  So, just back it up
-	 * by one word.  Thanks to Lynn Kerby for the fix and James McMechan
-	 * for the original diagnosis.
-	 */
-	if(*cow_offset == ((bitmap_len + sizeof(unsigned long) - 1) /
-			   sizeof(unsigned long) - 1))
-		(*cow_offset)--;
-
-	bitmap_words[0] = bitmap[*cow_offset];
-	bitmap_words[1] = bitmap[*cow_offset + 1];
-
-	*cow_offset *= sizeof(unsigned long);
-	*cow_offset += bitmap_offset;
-}
-
-static void cowify_req(struct io_thread_req *req, unsigned long *bitmap,
-		       __u64 bitmap_offset, __u64 bitmap_len)
-{
-	__u64 sector = req->offset >> 9;
-	int i;
-
-	if(req->length > (sizeof(req->sector_mask) * 8) << 9)
-		panic("Operation too long");
-
-	if(req->op == UBD_READ) {
-		for(i = 0; i < req->length >> 9; i++){
-			if(ubd_test_bit(sector + i, (unsigned char *) bitmap))
-				ubd_set_bit(i, (unsigned char *) 
-					    &req->sector_mask);
-                }
-	}
-	else cowify_bitmap(req->offset, req->length, &req->sector_mask,
-			   &req->cow_offset, bitmap, bitmap_offset,
-			   req->bitmap_words, bitmap_len);
+                ubd_set_bit(sector + i, bitmap);
+        }
 }
 
 /* Called with ubd_io_lock held */
-static int prepare_request(struct request *req, struct io_thread_req *io_req)
+static int prepare_request(struct request *req, struct io_thread_req *io_req,
+                           unsigned long long offset, int page_offset,
+                           int len, struct page *page)
 {
 	struct gendisk *disk = req->rq_disk;
 	struct ubd *dev = disk->private_data;
-	__u64 offset;
-	int len;
-
-	if(req->rq_status == RQ_INACTIVE) return(1);
 
 	/* This should be impossible now */
 	if((rq_data_dir(req) == WRITE) && !dev->openflags.w){
 		printk("Write attempted on readonly ubd device %s\n", 
 		       disk->disk_name);
-		end_request(req, 0);
+                ubd_end_request(req, 0, 0);
 		return(1);
 	}
 
-	offset = ((__u64) req->sector) << 9;
-	len = req->current_nr_sectors << 9;
-
 	io_req->fds[0] = (dev->cow.file != NULL) ? dev->cow.fd : dev->fd;
 	io_req->fds[1] = dev->fd;
-	io_req->cow_offset = -1;
 	io_req->offset = offset;
 	io_req->length = len;
 	io_req->error = 0;
-	io_req->sector_mask = 0;
-
-	io_req->op = (rq_data_dir(req) == READ) ? UBD_READ : UBD_WRITE;
+	io_req->op = (rq_data_dir(req) == READ) ? AIO_READ : AIO_WRITE;
 	io_req->offsets[0] = 0;
 	io_req->offsets[1] = dev->cow.data_offset;
-	io_req->buffer = req->buffer;
+        io_req->buffer = page_address(page) + page_offset;
 	io_req->sectorsize = 1 << 9;
+        io_req->bitmap_offset = dev->cow.bitmap_offset;
+        io_req->bitmap_start = -1;
+        io_req->bitmap_end = -1;
 
-	if(dev->cow.file != NULL)
-		cowify_req(io_req, dev->cow.bitmap, dev->cow.bitmap_offset,
-			   dev->cow.bitmap_len);
-
+        if((dev->cow.file != NULL) && (io_req->op == UBD_WRITE))
+                cowify_bitmap(io_req, dev->cow.bitmap);
 	return(0);
 }
 
@@ -1030,30 +996,36 @@ static void do_ubd_request(request_queue_t *q)
 {
 	struct io_thread_req io_req;
 	struct request *req;
-	int err, n;
+	__u64 sector;
+	int err;
 
-	if(thread_fd == -1){
-		while((req = elv_next_request(q)) != NULL){
-			err = prepare_request(req, &io_req);
-			if(!err){
-				do_io(&io_req);
-				__ubd_finish(req, io_req.error);
-			}
-		}
-	}
-	else {
-		if(do_ubd || (req = elv_next_request(q)) == NULL)
-			return;
-		err = prepare_request(req, &io_req);
-		if(!err){
-			do_ubd = ubd_handler;
-			n = os_write_file(thread_fd, (char *) &io_req,
-					 sizeof(io_req));
-			if(n != sizeof(io_req))
-				printk("write to io thread failed, "
-				       "errno = %d\n", -n);
+	if(in_ubd)
+		return;
+	in_ubd = 1;
+	while((req = elv_next_request(q)) != NULL){
+		struct gendisk *disk = req->rq_disk;
+		struct ubd *dev = disk->private_data;
+		int n, i;
+
+		blkdev_dequeue_request(req);
+
+		sector = req->sector;
+		n = blk_rq_map_sg(q, req, dev->sg);
+
+		for(i = 0; i < n; i++){
+			struct scatterlist *sg = &dev->sg[i];
+
+			err = prepare_request(req, &io_req, sector << 9,
+					      sg->offset, sg->length,
+					      sg->page);
+			if(err)
+				continue;
+
+			sector += sg->length >> 9;
+			do_io(&io_req, req, dev->cow.bitmap);
 		}
 	}
+	in_ubd = 0;
 }
 
 static int ubd_ioctl(struct inode * inode, struct file * file,
@@ -1269,131 +1241,95 @@ int create_cow_file(char *cow_file, char *backing_file, struct openflags flags,
 	return(err);
 }
 
-static int update_bitmap(struct io_thread_req *req)
+void do_io(struct io_thread_req *req, struct request *r, unsigned long *bitmap)
 {
-	int n;
+        struct ubd_aio *aio;
+        struct bitmap_io *bitmap_io = NULL;
+        char *buf;
+        void *bitmap_buf = NULL;
+        unsigned long len, sector;
+        int nsectors, start, end, bit, err;
+        __u64 off;
 
-	if(req->cow_offset == -1)
-		return(0);
+        if(req->bitmap_start != -1){
+                /* Round up to the nearest word */
+                int round = sizeof(unsigned long);
+                len = (req->bitmap_end - req->bitmap_start +
+                       round * 8 - 1) / (round * 8);
+                len *= round;
 
-	n = os_seek_file(req->fds[1], req->cow_offset);
-	if(n < 0){
-		printk("do_io - bitmap lseek failed : err = %d\n", -n);
-		return(1);
-	}
+                off = req->bitmap_start / (8 * round);
+                off *= round;
 
-	n = os_write_file(req->fds[1], &req->bitmap_words,
-		          sizeof(req->bitmap_words));
-	if(n != sizeof(req->bitmap_words)){
-		printk("do_io - bitmap update failed, err = %d fd = %d\n", -n,
-		       req->fds[1]);
-		return(1);
-	}
+                bitmap_io = kmalloc(sizeof(*bitmap_io), GFP_KERNEL);
+                if(bitmap_io == NULL){
+                        printk("Failed to kmalloc bitmap IO\n");
+                        req->error = 1;
+                        return;
+                }
 
-	return(0);
+                bitmap_buf = kmalloc(len, GFP_KERNEL);
+                if(bitmap_buf == NULL){
+                        printk("do_io : kmalloc of bitmap chunk "
+                               "failed\n");
+                        kfree(bitmap_io);
+                        req->error = 1;
+                        return;
+                }
+                memcpy(bitmap_buf, &bitmap[off / sizeof(bitmap[0])], len);
+
+                *bitmap_io = ((struct bitmap_io)
+                        { .count	= ATOMIC_INIT(0),
+                          .aio		= INIT_AIO(AIO_WRITE, req->fds[1],
+                                                   bitmap_buf, len,
+                                                   req->bitmap_offset + off,
+                                                   ubd_reply_fd) } );
+        }
+
+        nsectors = req->length / req->sectorsize;
+        start = 0;
+        end = nsectors;
+        bit = 0;
+        do {
+                if(bitmap != NULL){
+                        sector = req->offset / req->sectorsize;
+                        bit = ubd_test_bit(sector + start, bitmap);
+                        end = start;
+                        while((end < nsectors) &&
+                              (ubd_test_bit(sector + end, bitmap) == bit))
+                                end++;
+                }
+
+                off = req->offsets[bit] + req->offset +
+                        start * req->sectorsize;
+                len = (end - start) * req->sectorsize;
+                buf = &req->buffer[start * req->sectorsize];
+
+                aio = kmalloc(sizeof(*aio), GFP_KERNEL);
+                if(aio == NULL){
+                        req->error = 1;
+                        return;
+                }
+
+                *aio = ((struct ubd_aio)
+                        { .aio		= INIT_AIO(req->op, req->fds[bit], buf,
+                                                   len, off, ubd_reply_fd),
+                          .len		= len,
+                          .req		= r,
+                          .bitmap	= bitmap_io,
+                          .bitmap_buf 	= bitmap_buf });
+
+                if(aio->bitmap != NULL)
+                        atomic_inc(&aio->bitmap->count);
+
+                err = submit_aio(&aio->aio);
+                if(err){
+                        printk("do_io - submit_aio failed, "
+                               "err = %d\n", err);
+                        req->error = 1;
+                        return;
+                }
+
+                start = end;
+        } while(start < nsectors);
 }
-
-void do_io(struct io_thread_req *req)
-{
-	char *buf;
-	unsigned long len;
-	int n, nsectors, start, end, bit;
-	int err;
-	__u64 off;
-
-	nsectors = req->length / req->sectorsize;
-	start = 0;
-	do {
-		bit = ubd_test_bit(start, (unsigned char *) &req->sector_mask);
-		end = start;
-		while((end < nsectors) &&
-		      (ubd_test_bit(end, (unsigned char *)
-				    &req->sector_mask) == bit))
-			end++;
-
-		off = req->offset + req->offsets[bit] +
-			start * req->sectorsize;
-		len = (end - start) * req->sectorsize;
-		buf = &req->buffer[start * req->sectorsize];
-
-		err = os_seek_file(req->fds[bit], off);
-		if(err < 0){
-			printk("do_io - lseek failed : err = %d\n", -err);
-			req->error = 1;
-			return;
-		}
-		if(req->op == UBD_READ){
-			n = 0;
-			do {
-				buf = &buf[n];
-				len -= n;
-				n = os_read_file(req->fds[bit], buf, len);
-				if (n < 0) {
-					printk("do_io - read failed, err = %d "
-					       "fd = %d\n", -n, req->fds[bit]);
-					req->error = 1;
-					return;
-				}
-			} while((n < len) && (n != 0));
-			if (n < len) memset(&buf[n], 0, len - n);
-		} else {
-			n = os_write_file(req->fds[bit], buf, len);
-			if(n != len){
-				printk("do_io - write failed err = %d "
-				       "fd = %d\n", -n, req->fds[bit]);
-				req->error = 1;
-				return;
-			}
-		}
-
-		start = end;
-	} while(start < nsectors);
-
-	req->error = update_bitmap(req);
-}
-
-/* Changed in start_io_thread, which is serialized by being called only
- * from ubd_init, which is an initcall.
- */
-int kernel_fd = -1;
-
-/* Only changed by the io thread */
-int io_count = 0;
-
-int io_thread(void *arg)
-{
-	struct io_thread_req req;
-	int n;
-
-	ignore_sigwinch_sig();
-	while(1){
-		n = os_read_file(kernel_fd, &req, sizeof(req));
-		if(n != sizeof(req)){
-			if(n < 0)
-				printk("io_thread - read failed, fd = %d, "
-				       "err = %d\n", kernel_fd, -n);
-			else {
-				printk("io_thread - short read, fd = %d, "
-				       "length = %d\n", kernel_fd, n);
-			}
-			continue;
-		}
-		io_count++;
-		do_io(&req);
-		n = os_write_file(kernel_fd, &req, sizeof(req));
-		if(n != sizeof(req))
-			printk("io_thread - write failed, fd = %d, err = %d\n",
-			       kernel_fd, -n);
-	}
-}
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only.  This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
diff --git a/arch/um/include/aio.h b/arch/um/include/aio.h
index 423bae9153f8..83f16877ab08 100644
--- a/arch/um/include/aio.h
+++ b/arch/um/include/aio.h
@@ -14,15 +14,27 @@ struct aio_thread_reply {
 };
 
 struct aio_context {
+	enum aio_type type;
+	int fd;
+	void *data;
+	int len;
+	unsigned long long offset;
 	int reply_fd;
 	struct aio_context *next;
 };
 
+#define INIT_AIO(aio_type, aio_fd, aio_data, aio_len, aio_offset, \
+		 aio_reply_fd) \
+	{ .type 	= aio_type, \
+	  .fd		= aio_fd, \
+	  .data		= aio_data, \
+	  .len		= aio_len, \
+	  .offset	= aio_offset, \
+	  .reply_fd	= aio_reply_fd }
+
 #define INIT_AIO_CONTEXT { .reply_fd	= -1, \
 			   .next	= NULL }
 
-extern int submit_aio(enum aio_type type, int fd, char *buf, int len,
-		      unsigned long long offset, int reply_fd,
-                      struct aio_context *aio);
+extern int submit_aio(struct aio_context *aio);
 
 #endif
diff --git a/arch/um/os-Linux/aio.c b/arch/um/os-Linux/aio.c
index f2ca2992bbd6..b04897cd995d 100644
--- a/arch/um/os-Linux/aio.c
+++ b/arch/um/os-Linux/aio.c
@@ -6,6 +6,7 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <signal.h>
+#include <string.h>
 #include <errno.h>
 #include <sched.h>
 #include <sys/syscall.h>
@@ -16,18 +17,31 @@
 #include "user.h"
 #include "mode.h"
 
-struct aio_thread_req {
-        enum aio_type type;
-        int io_fd;
-        unsigned long long offset;
-        char *buf;
-        int len;
-        struct aio_context *aio;
-};
-
 static int aio_req_fd_r = -1;
 static int aio_req_fd_w = -1;
 
+static int update_aio(struct aio_context *aio, int res)
+{
+        if(res < 0)
+                aio->len = res;
+        else if((res == 0) && (aio->type == AIO_READ)){
+                /* This is the EOF case - we have hit the end of the file
+                 * and it ends in a partial block, so we fill the end of
+                 * the block with zeros and claim success.
+                 */
+                memset(aio->data, 0, aio->len);
+                aio->len = 0;
+        }
+        else if(res > 0){
+                aio->len -= res;
+                aio->data += res;
+                aio->offset += res;
+                return aio->len;
+        }
+
+        return 0;
+}
+
 #if defined(HAVE_AIO_ABI)
 #include <linux/aio_abi.h>
 
@@ -66,8 +80,7 @@ static long io_getevents(aio_context_t ctx_id, long min_nr, long nr,
  * that it now backs the mmapped area.
  */
 
-static int do_aio(aio_context_t ctx, enum aio_type type, int fd, char *buf,
-                  int len, unsigned long long offset, struct aio_context *aio)
+static int do_aio(aio_context_t ctx, struct aio_context *aio)
 {
         struct iocb iocb, *iocbp = &iocb;
         char c;
@@ -75,37 +88,37 @@ static int do_aio(aio_context_t ctx, enum aio_type type, int fd, char *buf,
 
         iocb = ((struct iocb) { .aio_data 	= (unsigned long) aio,
                                 .aio_reqprio	= 0,
-                                .aio_fildes	= fd,
-                                .aio_buf	= (unsigned long) buf,
-                                .aio_nbytes	= len,
-                                .aio_offset	= offset,
+                                .aio_fildes	= aio->fd,
+                                .aio_buf	= (unsigned long) aio->data,
+                                .aio_nbytes	= aio->len,
+                                .aio_offset	= aio->offset,
                                 .aio_reserved1	= 0,
                                 .aio_reserved2	= 0,
                                 .aio_reserved3	= 0 });
 
-        switch(type){
+        switch(aio->type){
         case AIO_READ:
                 iocb.aio_lio_opcode = IOCB_CMD_PREAD;
-                err = io_submit(ctx, 1, &iocbp);
                 break;
         case AIO_WRITE:
                 iocb.aio_lio_opcode = IOCB_CMD_PWRITE;
-                err = io_submit(ctx, 1, &iocbp);
                 break;
         case AIO_MMAP:
                 iocb.aio_lio_opcode = IOCB_CMD_PREAD;
                 iocb.aio_buf = (unsigned long) &c;
                 iocb.aio_nbytes = sizeof(c);
-                err = io_submit(ctx, 1, &iocbp);
                 break;
         default:
-                printk("Bogus op in do_aio - %d\n", type);
+                printk("Bogus op in do_aio - %d\n", aio->type);
                 err = -EINVAL;
-                break;
+                goto out;
         }
+
+        err = io_submit(ctx, 1, &iocbp);
         if(err > 0)
                 err = 0;
 
+ out:
         return err;
 }
 
@@ -114,8 +127,9 @@ static aio_context_t ctx = 0;
 static int aio_thread(void *arg)
 {
         struct aio_thread_reply reply;
+        struct aio_context *aio;
         struct io_event event;
-        int err, n, reply_fd;
+        int err, n;
 
         signal(SIGWINCH, SIG_IGN);
 
@@ -128,15 +142,21 @@ static int aio_thread(void *arg)
                                "errno = %d\n", errno);
                 }
                 else {
+			aio = (struct aio_context *) event.data;
+			if(update_aio(aio, event.res)){
+				do_aio(ctx, aio);
+				continue;
+			}
+
                         reply = ((struct aio_thread_reply)
-                                { .data = (void *) (long) event.data,
-                                  .err	= event.res });
-                        reply_fd = ((struct aio_context *) reply.data)->reply_fd;
-                        err = os_write_file(reply_fd, &reply, sizeof(reply));
+				{ .data = aio,
+				  .err	= aio->len });
+			err = os_write_file(aio->reply_fd, &reply,
+					    sizeof(reply));
                         if(err != sizeof(reply))
-                                printk("not_aio_thread - write failed, "
-                                       "fd = %d, err = %d\n",
-                                       aio_req_fd_r, -err);
+				printk("aio_thread - write failed, "
+				       "fd = %d, err = %d\n", aio->reply_fd,
+				       -err);
                 }
         }
         return 0;
@@ -144,35 +164,35 @@ static int aio_thread(void *arg)
 
 #endif
 
-static int do_not_aio(struct aio_thread_req *req)
+static int do_not_aio(struct aio_context *aio)
 {
         char c;
         int err;
 
-        switch(req->type){
+        switch(aio->type){
         case AIO_READ:
-                err = os_seek_file(req->io_fd, req->offset);
+                err = os_seek_file(aio->fd, aio->offset);
                 if(err)
                         goto out;
 
-                err = os_read_file(req->io_fd, req->buf, req->len);
+                err = os_read_file(aio->fd, aio->data, aio->len);
                 break;
         case AIO_WRITE:
-                err = os_seek_file(req->io_fd, req->offset);
+                err = os_seek_file(aio->fd, aio->offset);
                 if(err)
                         goto out;
 
-                err = os_write_file(req->io_fd, req->buf, req->len);
+                err = os_write_file(aio->fd, aio->data, aio->len);
                 break;
         case AIO_MMAP:
-                err = os_seek_file(req->io_fd, req->offset);
+                err = os_seek_file(aio->fd, aio->offset);
                 if(err)
                         goto out;
 
-                err = os_read_file(req->io_fd, &c, sizeof(c));
+                err = os_read_file(aio->fd, &c, sizeof(c));
                 break;
         default:
-                printk("do_not_aio - bad request type : %d\n", req->type);
+                printk("do_not_aio - bad request type : %d\n", aio->type);
                 err = -EINVAL;
                 break;
         }
@@ -183,14 +203,14 @@ static int do_not_aio(struct aio_thread_req *req)
 
 static int not_aio_thread(void *arg)
 {
-        struct aio_thread_req req;
+        struct aio_context *aio;
         struct aio_thread_reply reply;
         int err;
 
         signal(SIGWINCH, SIG_IGN);
         while(1){
-                err = os_read_file(aio_req_fd_r, &req, sizeof(req));
-                if(err != sizeof(req)){
+                err = os_read_file(aio_req_fd_r, &aio, sizeof(aio));
+                if(err != sizeof(aio)){
                         if(err < 0)
                                 printk("not_aio_thread - read failed, "
                                        "fd = %d, err = %d\n", aio_req_fd_r,
@@ -201,17 +221,34 @@ static int not_aio_thread(void *arg)
                         }
                         continue;
                 }
-                err = do_not_aio(&req);
-                reply = ((struct aio_thread_reply) { .data 	= req.aio,
-                                                     .err	= err });
-                err = os_write_file(req.aio->reply_fd, &reply, sizeof(reply));
+ again:
+                err = do_not_aio(aio);
+
+                if(update_aio(aio, err))
+                        goto again;
+
+                reply = ((struct aio_thread_reply) { .data 	= aio,
+                                                     .err	= aio->len });
+                err = os_write_file(aio->reply_fd, &reply, sizeof(reply));
                 if(err != sizeof(reply))
                         printk("not_aio_thread - write failed, fd = %d, "
                                "err = %d\n", aio_req_fd_r, -err);
         }
 }
 
+static int submit_aio_24(struct aio_context *aio)
+{
+        int err;
+
+        err = os_write_file(aio_req_fd_w, &aio, sizeof(aio));
+        if(err == sizeof(aio))
+                err = 0;
+
+        return err;
+}
+
 static int aio_pid = -1;
+static int (*submit_proc)(struct aio_context *aio);
 
 static int init_aio_24(void)
 {
@@ -243,11 +280,33 @@ static int init_aio_24(void)
 #endif
 	printk("2.6 host AIO support not used - falling back to I/O "
 	       "thread\n");
+
+	submit_proc = submit_aio_24;
+
         return 0;
 }
 
 #ifdef HAVE_AIO_ABI
 #define DEFAULT_24_AIO 0
+static int submit_aio_26(struct aio_context *aio)
+{
+	struct aio_thread_reply reply;
+	int err;
+
+	err = do_aio(ctx, aio);
+	if(err){
+		reply = ((struct aio_thread_reply) { .data = aio,
+					             .err  = err });
+		err = os_write_file(aio->reply_fd, &reply, sizeof(reply));
+		if(err != sizeof(reply))
+			printk("submit_aio_26 - write failed, "
+			       "fd = %d, err = %d\n", aio->reply_fd, -err);
+		else err = 0;
+	}
+
+	return err;
+}
+
 static int init_aio_26(void)
 {
         unsigned long stack;
@@ -267,39 +326,22 @@ static int init_aio_26(void)
         aio_pid = err;
 
 	printk("Using 2.6 host AIO\n");
+
+	submit_proc = submit_aio_26;
+
         return 0;
 }
 
-static int submit_aio_26(enum aio_type type, int io_fd, char *buf, int len,
-			 unsigned long long offset, struct aio_context *aio)
-{
-        struct aio_thread_reply reply;
-        int err;
-
-        err = do_aio(ctx, type, io_fd, buf, len, offset, aio);
-        if(err){
-                reply = ((struct aio_thread_reply) { .data = aio,
-                                                     .err  = err });
-                err = os_write_file(aio->reply_fd, &reply, sizeof(reply));
-                if(err != sizeof(reply))
-                        printk("submit_aio_26 - write failed, "
-                               "fd = %d, err = %d\n", aio->reply_fd, -err);
-                else err = 0;
-        }
-
-        return err;
-}
-
 #else
 #define DEFAULT_24_AIO 1
-static int init_aio_26(void)
+static int submit_aio_26(struct aio_context *aio)
 {
         return -ENOSYS;
 }
 
-static int submit_aio_26(enum aio_type type, int io_fd, char *buf, int len,
-			 unsigned long long offset, struct aio_context *aio)
+static int init_aio_26(void)
 {
+	submit_proc = submit_aio_26;
         return -ENOSYS;
 }
 #endif
@@ -366,33 +408,7 @@ static void exit_aio(void)
 
 __uml_exitcall(exit_aio);
 
-static int submit_aio_24(enum aio_type type, int io_fd, char *buf, int len,
-			 unsigned long long offset, struct aio_context *aio)
+int submit_aio(struct aio_context *aio)
 {
-        struct aio_thread_req req = { .type 		= type,
-                                      .io_fd		= io_fd,
-                                      .offset		= offset,
-                                      .buf		= buf,
-                                      .len		= len,
-                                      .aio		= aio,
-        };
-        int err;
-
-        err = os_write_file(aio_req_fd_w, &req, sizeof(req));
-        if(err == sizeof(req))
-                err = 0;
-
-        return err;
-}
-
-int submit_aio(enum aio_type type, int io_fd, char *buf, int len,
-               unsigned long long offset, int reply_fd,
-               struct aio_context *aio)
-{
-        aio->reply_fd = reply_fd;
-        if(aio_24)
-                return submit_aio_24(type, io_fd, buf, len, offset, aio);
-        else {
-                return submit_aio_26(type, io_fd, buf, len, offset, aio);
-        }
+	return (*submit_proc)(aio);
 }