Merge with master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6.git

7 files changed, 48 insertions, 346 deletions

diff --git a/arch/um/drivers/chan_kern.c b/arch/um/drivers/chan_kern.c
index 0150038af795..14a12d6b3df6 100644
--- a/arch/um/drivers/chan_kern.c
+++ b/arch/um/drivers/chan_kern.c
@@ -20,9 +20,17 @@
 #include "os.h"
 
 #ifdef CONFIG_NOCONFIG_CHAN
+
+/* The printk's here are wrong because we are complaining that there is no
+ * output device, but printk is printing to that output device.  The user will
+ * never see the error.  printf would be better, except it can't run on a
+ * kernel stack because it will overflow it.
+ * Use printk for now since that will avoid crashing.
+ */
+
 static void *not_configged_init(char *str, int device, struct chan_opts *opts)
 {
-        printf(KERN_ERR "Using a channel type which is configured out of "
+        printk(KERN_ERR "Using a channel type which is configured out of "
                "UML\n");
         return(NULL);
 }
@@ -30,27 +38,27 @@ static void *not_configged_init(char *str, int device, struct chan_opts *opts)
 static int not_configged_open(int input, int output, int primary, void *data,
                               char **dev_out)
 {
-        printf(KERN_ERR "Using a channel type which is configured out of "
+        printk(KERN_ERR "Using a channel type which is configured out of "
                "UML\n");
         return(-ENODEV);
 }
 
 static void not_configged_close(int fd, void *data)
 {
-        printf(KERN_ERR "Using a channel type which is configured out of "
+        printk(KERN_ERR "Using a channel type which is configured out of "
                "UML\n");
 }
 
 static int not_configged_read(int fd, char *c_out, void *data)
 {
-        printf(KERN_ERR "Using a channel type which is configured out of "
+        printk(KERN_ERR "Using a channel type which is configured out of "
                "UML\n");
         return(-EIO);
 }
 
 static int not_configged_write(int fd, const char *buf, int len, void *data)
 {
-        printf(KERN_ERR "Using a channel type which is configured out of "
+        printk(KERN_ERR "Using a channel type which is configured out of "
                "UML\n");
         return(-EIO);
 }
@@ -58,7 +66,7 @@ static int not_configged_write(int fd, const char *buf, int len, void *data)
 static int not_configged_console_write(int fd, const char *buf, int len,
                                        void *data)
 {
-        printf(KERN_ERR "Using a channel type which is configured out of "
+        printk(KERN_ERR "Using a channel type which is configured out of "
                "UML\n");
         return(-EIO);
 }
@@ -66,7 +74,7 @@ static int not_configged_console_write(int fd, const char *buf, int len,
 static int not_configged_window_size(int fd, void *data, unsigned short *rows,
                                      unsigned short *cols)
 {
-        printf(KERN_ERR "Using a channel type which is configured out of "
+        printk(KERN_ERR "Using a channel type which is configured out of "
                "UML\n");
         return(-ENODEV);
 }
diff --git a/arch/um/drivers/mcast_kern.c b/arch/um/drivers/mcast_kern.c
index faf714e87b5b..217438cdef33 100644
--- a/arch/um/drivers/mcast_kern.c
+++ b/arch/um/drivers/mcast_kern.c
@@ -73,7 +73,6 @@ int mcast_setup(char *str, char **mac_out, void *data)
         struct mcast_init *init = data;
         char *port_str = NULL, *ttl_str = NULL, *remain;
         char *last;
-        int n;
 
         *init = ((struct mcast_init)
                 { .addr         = "239.192.168.1",
@@ -89,13 +88,12 @@ int mcast_setup(char *str, char **mac_out, void *data)
         }
         
         if(port_str != NULL){
-                n = simple_strtoul(port_str, &last, 10);
+                init->port = simple_strtoul(port_str, &last, 10);
                 if((*last != '\0') || (last == port_str)){
                         printk(KERN_ERR "mcast_setup - Bad port : '%s'\n", 
                                port_str);
                         return(0);
                 }
-                init->port = htons(n);
         }
 
         if(ttl_str != NULL){
diff --git a/arch/um/drivers/mcast_user.c b/arch/um/drivers/mcast_user.c
index 0fe1d9fa9139..7a0d115b29d0 100644
--- a/arch/um/drivers/mcast_user.c
+++ b/arch/um/drivers/mcast_user.c
@@ -38,7 +38,7 @@ static struct sockaddr_in *new_addr(char *addr, unsigned short port)
         }
         sin->sin_family = AF_INET;
         sin->sin_addr.s_addr = in_aton(addr);
-        sin->sin_port = port;
+        sin->sin_port = htons(port);
         return(sin);
 }
 
@@ -55,28 +55,25 @@ static int mcast_open(void *data)
         struct mcast_data *pri = data;
         struct sockaddr_in *sin = pri->mcast_addr;
         struct ip_mreq mreq;
-        int fd, yes = 1;
+        int fd = -EINVAL, yes = 1, err = -EINVAL;;
 
 
-        if ((sin->sin_addr.s_addr == 0) || (sin->sin_port == 0)) {
-                fd = -EINVAL;
+        if ((sin->sin_addr.s_addr == 0) || (sin->sin_port == 0))
                 goto out;
-        }
 
         fd = socket(AF_INET, SOCK_DGRAM, 0);
+
         if (fd < 0){
                 printk("mcast_open : data socket failed, errno = %d\n", 
                        errno);
-                fd = -ENOMEM;
+                fd = -errno;
                 goto out;
         }
 
         if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
                 printk("mcast_open: SO_REUSEADDR failed, errno = %d\n",
                         errno);
-                os_close_file(fd);
-                fd = -EINVAL;
-                goto out;
+                goto out_close;
         }
 
         /* set ttl according to config */
@@ -84,26 +81,20 @@ static int mcast_open(void *data)
                        sizeof(pri->ttl)) < 0) {
                 printk("mcast_open: IP_MULTICAST_TTL failed, error = %d\n",
                         errno);
-                os_close_file(fd);
-                fd = -EINVAL;
-                goto out;
+                goto out_close;
         }
 
         /* set LOOP, so data does get fed back to local sockets */
         if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) {
                 printk("mcast_open: IP_MULTICAST_LOOP failed, error = %d\n",
                         errno);
-                os_close_file(fd);
-                fd = -EINVAL;
-                goto out;
+                goto out_close;
         }
 
         /* bind socket to mcast address */
         if (bind(fd, (struct sockaddr *) sin, sizeof(*sin)) < 0) {
                 printk("mcast_open : data bind failed, errno = %d\n", errno);
-                os_close_file(fd);
-                fd = -EINVAL;
-                goto out;
+                goto out_close;
         }               
         
         /* subscribe to the multicast group */
@@ -117,12 +108,15 @@ static int mcast_open(void *data)
                        "interface on the host.\n");
                 printk("eth0 should be configured in order to use the "
                        "multicast transport.\n");
-                os_close_file(fd);
-                fd = -EINVAL;
+                goto out_close;
         }
 
  out:
-        return(fd);
+        return fd;
+
+ out_close:
+        os_close_file(fd);
+        return err;
 }
 
 static void mcast_close(int fd, void *data)
@@ -164,14 +158,3 @@ struct net_user_info mcast_user_info = {
         .delete_address = NULL,
         .max_packet     = MAX_PACKET - ETH_HEADER_OTHER
 };
-
-/*
- * 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/drivers/random.c b/arch/um/drivers/random.c
index d43e9fab05a7..f9e22198e011 100644
--- a/arch/um/drivers/random.c
+++ b/arch/um/drivers/random.c
@@ -1,5 +1,10 @@
-/* Much of this ripped from hw_random.c */
-
+/* Copyright (C) 2005 Jeff Dike <jdike@addtoit.com> */
+/* Much of this ripped from drivers/char/hw_random.c, see there for other
+ * copyright.
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ */
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/miscdevice.h>
@@ -12,8 +17,6 @@
  */
 #define RNG_VERSION "1.0.0"
 #define RNG_MODULE_NAME "random"
-#define RNG_DRIVER_NAME   RNG_MODULE_NAME " virtual driver " RNG_VERSION
-#define PFX RNG_MODULE_NAME ": "
 
 #define RNG_MISCDEV_MINOR               183 /* official */
 
@@ -98,7 +101,7 @@ static int __init rng_init (void)
 
         err = misc_register (&rng_miscdev);
         if (err) {
-                printk (KERN_ERR PFX "misc device register failed\n");
+                printk (KERN_ERR RNG_MODULE_NAME ": misc device register failed\n");
                 goto err_out_cleanup_hw;
         }
 
@@ -120,3 +123,6 @@ static void __exit rng_cleanup (void)
 
 module_init (rng_init);
 module_exit (rng_cleanup);
+
+MODULE_DESCRIPTION("UML Host Random Number Generator (RNG) driver");
+MODULE_LICENSE("GPL");
diff --git a/arch/um/drivers/ssl.c b/arch/um/drivers/ssl.c
index a2bac429f3d4..b32a77010fbe 100644
--- a/arch/um/drivers/ssl.c
+++ b/arch/um/drivers/ssl.c
@@ -22,7 +22,6 @@
 #include "init.h"
 #include "irq_user.h"
 #include "mconsole_kern.h"
-#include "2_5compat.h"
 
 static int ssl_version = 1;
 
diff --git a/arch/um/drivers/stdio_console.c b/arch/um/drivers/stdio_console.c
index 361d0be342b3..afbe1e71ed83 100644
--- a/arch/um/drivers/stdio_console.c
+++ b/arch/um/drivers/stdio_console.c
@@ -28,7 +28,6 @@
 #include "irq_user.h"
 #include "mconsole_kern.h"
 #include "init.h"
-#include "2_5compat.h"
 
 #define MAX_TTYS (16)
 
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 9a56ff94308d..2a7f6892c55c 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -49,13 +49,12 @@
 #include "irq_user.h"
 #include "irq_kern.h"
 #include "ubd_user.h"
-#include "2_5compat.h"
 #include "os.h"
 #include "mem.h"
 #include "mem_kern.h"
 #include "cow.h"
 
-enum ubd_req { UBD_READ, UBD_WRITE, UBD_MMAP };
+enum ubd_req { UBD_READ, UBD_WRITE };
 
 struct io_thread_req {
         enum ubd_req op;
@@ -68,8 +67,6 @@ struct io_thread_req {
         unsigned long sector_mask;
         unsigned long long cow_offset;
         unsigned long bitmap_words[2];
-        int map_fd;
-        unsigned long long map_offset;
         int error;
 };
 
@@ -122,10 +119,6 @@ static int ubd_ioctl(struct inode * inode, struct file * file,
 
 #define MAX_DEV (8)
 
-/* Changed in early boot */
-static int ubd_do_mmap = 0;
-#define UBD_MMAP_BLOCK_SIZE PAGE_SIZE
-
 static struct block_device_operations ubd_blops = {
         .owner          = THIS_MODULE,
         .open           = ubd_open,
@@ -175,12 +168,6 @@ struct ubd {
         int no_cow;
         struct cow cow;
         struct platform_device pdev;
-
-        int map_writes;
-        int map_reads;
-        int nomap_writes;
-        int nomap_reads;
-        int write_maps;
 };
 
 #define DEFAULT_COW { \
@@ -200,11 +187,6 @@ struct ubd {
         .openflags =            OPEN_FLAGS, \
         .no_cow =               0, \
         .cow =                  DEFAULT_COW, \
-        .map_writes             = 0, \
-        .map_reads              = 0, \
-        .nomap_writes           = 0, \
-        .nomap_reads            = 0, \
-        .write_maps             = 0, \
 }
 
 struct ubd ubd_dev[MAX_DEV] = { [ 0 ... MAX_DEV - 1 ] = DEFAULT_UBD };
@@ -314,13 +296,6 @@ static int ubd_setup_common(char *str, int *index_out)
                 int major;
 
                 str++;
-                if(!strcmp(str, "mmap")){
-                        CHOOSE_MODE(printk("mmap not supported by the ubd "
-                                           "driver in tt mode\n"),
-                                    ubd_do_mmap = 1);
-                        return(0);
-                }
-
                 if(!strcmp(str, "sync")){
                         global_openflags = of_sync(global_openflags);
                         return(0);
@@ -464,9 +439,9 @@ static int udb_setup(char *str)
 __setup("udb", udb_setup);
 __uml_help(udb_setup,
 "udb\n"
-"    This option is here solely to catch ubd -> udb typos, which can be\n\n"
-"    to impossible to catch visually unless you specifically look for\n\n"
-"    them.  The only result of any option starting with 'udb' is an error\n\n"
+"    This option is here solely to catch ubd -> udb typos, which can be\n"
+"    to impossible to catch visually unless you specifically look for\n"
+"    them.  The only result of any option starting with 'udb' is an error\n"
 "    in the boot output.\n\n"
 );
 
@@ -524,7 +499,7 @@ static void ubd_handler(void)
 {
         struct io_thread_req req;
         struct request *rq = elv_next_request(ubd_queue);
-        int n, err;
+        int n;
 
         do_ubd = NULL;
         intr_count++;
@@ -538,19 +513,6 @@ static void ubd_handler(void)
                 return;
         }
         
-        if((req.op != UBD_MMAP) &&
-           ((req.offset != ((__u64) (rq->sector)) << 9) ||
-            (req.length != (rq->current_nr_sectors) << 9)))
-                panic("I/O op mismatch");
-        
-        if(req.map_fd != -1){
-                err = physmem_subst_mapping(req.buffer, req.map_fd,
-                                            req.map_offset, 1);
-                if(err)
-                        printk("ubd_handler - physmem_subst_mapping failed, "
-                               "err = %d\n", -err);
-        }
-
         ubd_finish(rq, req.error);
         reactivate_fd(thread_fd, UBD_IRQ);      
         do_ubd_request(ubd_queue);
@@ -583,14 +545,10 @@ static int ubd_file_size(struct ubd *dev, __u64 *size_out)
 
 static void ubd_close(struct ubd *dev)
 {
-        if(ubd_do_mmap)
-                physmem_forget_descriptor(dev->fd);
         os_close_file(dev->fd);
         if(dev->cow.file == NULL)
                 return;
 
-        if(ubd_do_mmap)
-                physmem_forget_descriptor(dev->cow.fd);
         os_close_file(dev->cow.fd);
         vfree(dev->cow.bitmap);
         dev->cow.bitmap = NULL;
@@ -1010,94 +968,13 @@ static void cowify_req(struct io_thread_req *req, unsigned long *bitmap,
                            req->bitmap_words, bitmap_len);
 }
 
-static int mmap_fd(struct request *req, struct ubd *dev, __u64 offset)
-{
-        __u64 sector;
-        unsigned char *bitmap;
-        int bit, i;
-
-        /* mmap must have been requested on the command line */
-        if(!ubd_do_mmap)
-                return(-1);
-
-        /* The buffer must be page aligned */
-        if(((unsigned long) req->buffer % UBD_MMAP_BLOCK_SIZE) != 0)
-                return(-1);
-
-        /* The request must be a page long */
-        if((req->current_nr_sectors << 9) != PAGE_SIZE)
-                return(-1);
-
-        if(dev->cow.file == NULL)
-                return(dev->fd);
-
-        sector = offset >> 9;
-        bitmap = (unsigned char *) dev->cow.bitmap;
-        bit = ubd_test_bit(sector, bitmap);
-
-        for(i = 1; i < req->current_nr_sectors; i++){
-                if(ubd_test_bit(sector + i, bitmap) != bit)
-                        return(-1);
-        }
-
-        if(bit || (rq_data_dir(req) == WRITE))
-                offset += dev->cow.data_offset;
-
-        /* The data on disk must be page aligned */
-        if((offset % UBD_MMAP_BLOCK_SIZE) != 0)
-                return(-1);
-
-        return(bit ? dev->fd : dev->cow.fd);
-}
-
-static int prepare_mmap_request(struct ubd *dev, int fd, __u64 offset,
-                                struct request *req,
-                                struct io_thread_req *io_req)
-{
-        int err;
-
-        if(rq_data_dir(req) == WRITE){
-                /* Writes are almost no-ops since the new data is already in the
-                 * host page cache
-                 */
-                dev->map_writes++;
-                if(dev->cow.file != NULL)
-                        cowify_bitmap(io_req->offset, io_req->length,
-                                      &io_req->sector_mask, &io_req->cow_offset,
-                                      dev->cow.bitmap, dev->cow.bitmap_offset,
-                                      io_req->bitmap_words,
-                                      dev->cow.bitmap_len);
-        }
-        else {
-                int w;
-
-                if((dev->cow.file != NULL) && (fd == dev->cow.fd))
-                        w = 0;
-                else w = dev->openflags.w;
-
-                if((dev->cow.file != NULL) && (fd == dev->fd))
-                        offset += dev->cow.data_offset;
-
-                err = physmem_subst_mapping(req->buffer, fd, offset, w);
-                if(err){
-                        printk("physmem_subst_mapping failed, err = %d\n",
-                               -err);
-                        return(1);
-                }
-                dev->map_reads++;
-        }
-        io_req->op = UBD_MMAP;
-        io_req->buffer = req->buffer;
-        return(0);
-}
-
 /* Called with ubd_io_lock held */
 static int prepare_request(struct request *req, struct io_thread_req *io_req)
 {
         struct gendisk *disk = req->rq_disk;
         struct ubd *dev = disk->private_data;
         __u64 offset;
-        int len, fd;
+        int len;
 
         if(req->rq_status == RQ_INACTIVE) return(1);
 
@@ -1114,34 +991,12 @@ static int prepare_request(struct request *req, struct io_thread_req *io_req)
 
         io_req->fds[0] = (dev->cow.file != NULL) ? dev->cow.fd : dev->fd;
         io_req->fds[1] = dev->fd;
-        io_req->map_fd = -1;
         io_req->cow_offset = -1;
         io_req->offset = offset;
         io_req->length = len;
         io_req->error = 0;
         io_req->sector_mask = 0;
 
-        fd = mmap_fd(req, dev, io_req->offset);
-        if(fd > 0){
-                /* If mmapping is otherwise OK, but the first access to the
-                 * page is a write, then it's not mapped in yet.  So we have
-                 * to write the data to disk first, then we can map the disk
-                 * page in and continue normally from there.
-                 */
-                if((rq_data_dir(req) == WRITE) && !is_remapped(req->buffer)){
-                        io_req->map_fd = dev->fd;
-                        io_req->map_offset = io_req->offset +
-                                dev->cow.data_offset;
-                        dev->write_maps++;
-                }
-                else return(prepare_mmap_request(dev, fd, io_req->offset, req,
-                                                 io_req));
-        }
-
-        if(rq_data_dir(req) == READ)
-                dev->nomap_reads++;
-        else dev->nomap_writes++;
-
         io_req->op = (rq_data_dir(req) == READ) ? UBD_READ : UBD_WRITE;
         io_req->offsets[0] = 0;
         io_req->offsets[1] = dev->cow.data_offset;
@@ -1229,143 +1084,6 @@ static int ubd_ioctl(struct inode * inode, struct file * file,
         return(-EINVAL);
 }
 
-static int ubd_check_remapped(int fd, unsigned long address, int is_write,
-                              __u64 offset)
-{
-        __u64 bitmap_offset;
-        unsigned long new_bitmap[2];
-        int i, err, n;
-
-        /* If it's not a write access, we can't do anything about it */
-        if(!is_write)
-                return(0);
-
-        /* We have a write */
-        for(i = 0; i < sizeof(ubd_dev) / sizeof(ubd_dev[0]); i++){
-                struct ubd *dev = &ubd_dev[i];
-
-                if((dev->fd != fd) && (dev->cow.fd != fd))
-                        continue;
-
-                /* It's a write to a ubd device */
-
-                /* This should be impossible now */
-                if(!dev->openflags.w){
-                        /* It's a write access on a read-only device - probably
-                         * shouldn't happen.  If the kernel is trying to change
-                         * something with no intention of writing it back out,
-                         * then this message will clue us in that this needs
-                         * fixing
-                         */
-                        printk("Write access to mapped page from readonly ubd "
-                               "device %d\n", i);
-                        return(0);
-                }
-
-                /* It's a write to a writeable ubd device - it must be COWed
-                 * because, otherwise, the page would have been mapped in
-                 * writeable
-                 */
-
-                if(!dev->cow.file)
-                        panic("Write fault on writeable non-COW ubd device %d",
-                              i);
-
-                /* It should also be an access to the backing file since the
-                 * COW pages should be mapped in read-write
-                 */
-
-                if(fd == dev->fd)
-                        panic("Write fault on a backing page of ubd "
-                              "device %d\n", i);
-
-                /* So, we do the write, copying the backing data to the COW
-                 * file...
-                 */
-
-                err = os_seek_file(dev->fd, offset + dev->cow.data_offset);
-                if(err < 0)
-                        panic("Couldn't seek to %lld in COW file of ubd "
-                              "device %d, err = %d",
-                              offset + dev->cow.data_offset, i, -err);
-
-                n = os_write_file(dev->fd, (void *) address, PAGE_SIZE);
-                if(n != PAGE_SIZE)
-                        panic("Couldn't copy data to COW file of ubd "
-                              "device %d, err = %d", i, -n);
-
-                /* ... updating the COW bitmap... */
-
-                cowify_bitmap(offset, PAGE_SIZE, NULL, &bitmap_offset,
-                              dev->cow.bitmap, dev->cow.bitmap_offset,
-                              new_bitmap, dev->cow.bitmap_len);
-
-                err = os_seek_file(dev->fd, bitmap_offset);
-                if(err < 0)
-                        panic("Couldn't seek to %lld in COW file of ubd "
-                              "device %d, err = %d", bitmap_offset, i, -err);
-
-                n = os_write_file(dev->fd, new_bitmap, sizeof(new_bitmap));
-                if(n != sizeof(new_bitmap))
-                        panic("Couldn't update bitmap  of ubd device %d, "
-                              "err = %d", i, -n);
-
-                /* Maybe we can map the COW page in, and maybe we can't.  If
-                 * it is a pre-V3 COW file, we can't, since the alignment will
-                 * be wrong.  If it is a V3 or later COW file which has been
-                 * moved to a system with a larger page size, then maybe we
-                 * can't, depending on the exact location of the page.
-                 */
-
-                offset += dev->cow.data_offset;
-
-                /* Remove the remapping, putting the original anonymous page
-                 * back.  If the COW file can be mapped in, that is done.
-                 * Otherwise, the COW page is read in.
-                 */
-
-                if(!physmem_remove_mapping((void *) address))
-                        panic("Address 0x%lx not remapped by ubd device %d",
-                              address, i);
-                if((offset % UBD_MMAP_BLOCK_SIZE) == 0)
-                        physmem_subst_mapping((void *) address, dev->fd,
-                                              offset, 1);
-                else {
-                        err = os_seek_file(dev->fd, offset);
-                        if(err < 0)
-                                panic("Couldn't seek to %lld in COW file of "
-                                      "ubd device %d, err = %d", offset, i,
-                                      -err);
-
-                        n = os_read_file(dev->fd, (void *) address, PAGE_SIZE);
-                        if(n != PAGE_SIZE)
-                                panic("Failed to read page from offset %llx of "
-                                      "COW file of ubd device %d, err = %d",
-                                      offset, i, -n);
-                }
-
-                return(1);
-        }
-
-        /* It's not a write on a ubd device */
-        return(0);
-}
-
-static struct remapper ubd_remapper = {
-        .list   = LIST_HEAD_INIT(ubd_remapper.list),
-        .proc   = ubd_check_remapped,
-};
-
-static int ubd_remapper_setup(void)
-{
-        if(ubd_do_mmap)
-                register_remapper(&ubd_remapper);
-
-        return(0);
-}
-
-__initcall(ubd_remapper_setup);
-
 static int same_backing_files(char *from_cmdline, char *from_cow, char *cow)
 {
         struct uml_stat buf1, buf2;
@@ -1568,15 +1286,6 @@ void do_io(struct io_thread_req *req)
         int err;
         __u64 off;
 
-        if(req->op == UBD_MMAP){
-                /* Touch the page to force the host to do any necessary IO to
-                 * get it into memory
-                 */
-                n = *((volatile int *) req->buffer);
-                req->error = update_bitmap(req);
-                return;
-        }
-
         nsectors = req->length / req->sectorsize;
         start = 0;
         do {