[PATCH] Remove blkmtd

Remove the blkmtd driver.

- An alternative exists (block2mtd) that hasn't had bug report for > 1 year.

- Most embedded people tend to use ancient kernels with custom patches from
mtd cvs and elsewhere, so the 1 year warning period neither helps nor hurts
them too much.

- It's in the way of klibc. The problems caused by pulling blkmtd support
are fairly low, while the problems caused by delaying klibc can be fairly
substantial. At best, this would be a severe burden on hpa's time.

Signed-off-by: Joern Engel <[e-mail]>
Acked-by: Thomas Gleixner <[e-mail]>
Cc: "H. Peter Anvin" <[e-mail]>
Cc: David Woodhouse <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/mtd/devices/Kconfig

···
 	  allocating space from Linux's available memory. Otherwise, leave
 	  this set to zero. Most people will want to leave this as zero.
 
-config MTD_BLKMTD
-	tristate "MTD emulation using block device"
+config MTD_BLOCK2MTD
+	tristate "MTD using block device"
 	depends on MTD
 	help
 	  This driver allows a block device to appear as an MTD. It would
···
 	  the system as an ATA drive.
 	  Testing MTD users (eg JFFS2) on large media and media that might
 	  be removed during a write (using the floppy drive).
-
-config MTD_BLOCK2MTD
-	tristate "MTD using block device (rewrite)"
-	depends on MTD && EXPERIMENTAL
-	help
-	  This driver is basically the same at MTD_BLKMTD above, but
-	  experienced some interface changes plus serious speedups.  In
-	  the long term, it should replace MTD_BLKMTD.  Right now, you
-	  shouldn't entrust important data to it yet.
 
 comment "Disk-On-Chip Device Drivers"
 

drivers/mtd/devices/Makefile

···
 obj-$(CONFIG_MTD_MS02NV)	+= ms02-nv.o
 obj-$(CONFIG_MTD_MTDRAM)	+= mtdram.o
 obj-$(CONFIG_MTD_LART)		+= lart.o
-obj-$(CONFIG_MTD_BLKMTD)	+= blkmtd.o
 obj-$(CONFIG_MTD_BLOCK2MTD)	+= block2mtd.o
 obj-$(CONFIG_MTD_DATAFLASH)	+= mtd_dataflash.o
 obj-$(CONFIG_MTD_M25P80)	+= m25p80.o

drivers/mtd/devices/blkmtd.c

···
-/*
- * $Id: blkmtd.c,v 1.27 2005/11/07 11:14:24 gleixner Exp $
- *
- * blkmtd.c - use a block device as a fake MTD
- *
- * Author: Simon Evans <[e-mail]>
- *
- * Copyright (C) 2001,2002 Simon Evans
- *
- * Licence: GPL
- *
- * How it works:
- *	The driver uses raw/io to read/write the device and the page
- *	cache to cache access. Writes update the page cache with the
- *	new data and mark it dirty and add the page into a BIO which
- *	is then written out.
- *
- *	It can be loaded Read-Only to prevent erases and writes to the
- *	medium.
- *
- */
-
-#include <linux/config.h>
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/blkdev.h>
-#include <linux/bio.h>
-#include <linux/pagemap.h>
-#include <linux/list.h>
-#include <linux/init.h>
-#include <linux/mount.h>
-#include <linux/mtd/mtd.h>
-#include <linux/mutex.h>
-
-#define err(format, arg...) printk(KERN_ERR "blkmtd: " format "\n" , ## arg)
-#define info(format, arg...) printk(KERN_INFO "blkmtd: " format "\n" , ## arg)
-#define warn(format, arg...) printk(KERN_WARNING "blkmtd: " format "\n" , ## arg)
-#define crit(format, arg...) printk(KERN_CRIT "blkmtd: " format "\n" , ## arg)
-
-
-/* Default erase size in K, always make it a multiple of PAGE_SIZE */
-#define CONFIG_MTD_BLKDEV_ERASESIZE (128 << 10)	/* 128KiB */
-#define VERSION "$Revision: 1.27 $"
-
-/* Info for the block device */
-struct blkmtd_dev {
-	struct list_head list;
-	struct block_device *blkdev;
-	struct mtd_info mtd_info;
-	struct mutex wrbuf_mutex;
-};
-
-
-/* Static info about the MTD, used in cleanup_module */
-static LIST_HEAD(blkmtd_device_list);
-
-
-static void blkmtd_sync(struct mtd_info *mtd);
-
-#define MAX_DEVICES 4
-
-/* Module parameters passed by insmod/modprobe */
-static char *device[MAX_DEVICES];    /* the block device to use */
-static int erasesz[MAX_DEVICES];     /* optional default erase size */
-static int ro[MAX_DEVICES];          /* optional read only flag */
-static int sync;
-
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Simon Evans <[e-mail]>");
-MODULE_DESCRIPTION("Emulate an MTD using a block device");
-module_param_array(device, charp, NULL, 0);
-MODULE_PARM_DESC(device, "block device to use");
-module_param_array(erasesz, int, NULL, 0);
-MODULE_PARM_DESC(erasesz, "optional erase size to use in KiB. eg 4=4KiB.");
-module_param_array(ro, bool, NULL, 0);
-MODULE_PARM_DESC(ro, "1=Read only, writes and erases cause errors");
-module_param(sync, bool, 0);
-MODULE_PARM_DESC(sync, "1=Synchronous writes");
-
-
-/* completion handler for BIO reads */
-static int bi_read_complete(struct bio *bio, unsigned int bytes_done, int error)
-{
-	if (bio->bi_size)
-		return 1;
-
-	complete((struct completion*)bio->bi_private);
-	return 0;
-}
-
-
-/* completion handler for BIO writes */
-static int bi_write_complete(struct bio *bio, unsigned int bytes_done, int error)
-{
-	const int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags);
-	struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1;
-
-	if (bio->bi_size)
-		return 1;
-
-	if(!uptodate)
-		err("bi_write_complete: not uptodate\n");
-
-	do {
-		struct page *page = bvec->bv_page;
-		DEBUG(3, "Cleaning up page %ld\n", page->index);
-		if (--bvec >= bio->bi_io_vec)
-			prefetchw(&bvec->bv_page->flags);
-
-		if (uptodate) {
-			SetPageUptodate(page);
-		} else {
-			ClearPageUptodate(page);
-			SetPageError(page);
-		}
-		clear_page_dirty(page);
-		unlock_page(page);
-		page_cache_release(page);
-	} while (bvec >= bio->bi_io_vec);
-
-	complete((struct completion*)bio->bi_private);
-	return 0;
-}
-
-
-/* read one page from the block device */
-static int blkmtd_readpage(struct blkmtd_dev *dev, struct page *page)
-{
-	struct bio *bio;
-	struct completion event;
-	int err = -ENOMEM;
-
-	if(PageUptodate(page)) {
-		DEBUG(2, "blkmtd: readpage page %ld is already upto date\n", page->index);
-		unlock_page(page);
-		return 0;
-	}
-
-	ClearPageUptodate(page);
-	ClearPageError(page);
-
-	bio = bio_alloc(GFP_KERNEL, 1);
-	if(bio) {
-		init_completion(&event);
-		bio->bi_bdev = dev->blkdev;
-		bio->bi_sector = page->index << (PAGE_SHIFT-9);
-		bio->bi_private = &event;
-		bio->bi_end_io = bi_read_complete;
-		if(bio_add_page(bio, page, PAGE_SIZE, 0) == PAGE_SIZE) {
-			submit_bio(READ_SYNC, bio);
-			wait_for_completion(&event);
-			err = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : -EIO;
-			bio_put(bio);
-		}
-	}
-
-	if(err)
-		SetPageError(page);
-	else
-		SetPageUptodate(page);
-	flush_dcache_page(page);
-	unlock_page(page);
-	return err;
-}
-
-
-/* write out the current BIO and wait for it to finish */
-static int blkmtd_write_out(struct bio *bio)
-{
-	struct completion event;
-	int err;
-
-	if(!bio->bi_vcnt) {
-		bio_put(bio);
-		return 0;
-	}
-
-	init_completion(&event);
-	bio->bi_private = &event;
-	bio->bi_end_io = bi_write_complete;
-	submit_bio(WRITE_SYNC, bio);
-	wait_for_completion(&event);
-	DEBUG(3, "submit_bio completed, bi_vcnt = %d\n", bio->bi_vcnt);
-	err = test_bit(BIO_UPTODATE, &bio->bi_flags) ? 0 : -EIO;
-	bio_put(bio);
-	return err;
-}
-
-
-/**
- * blkmtd_add_page - add a page to the current BIO
- * @bio: bio to add to (NULL to alloc initial bio)
- * @blkdev: block device
- * @page: page to add
- * @pagecnt: pages left to add
- *
- * Adds a page to the current bio, allocating it if necessary. If it cannot be
- * added, the current bio is written out and a new one is allocated. Returns
- * the new bio to add or NULL on error
- */
-static struct bio *blkmtd_add_page(struct bio *bio, struct block_device *blkdev,
-				   struct page *page, int pagecnt)
-{
-
- retry:
-	if(!bio) {
-		bio = bio_alloc(GFP_KERNEL, pagecnt);
-		if(!bio)
-			return NULL;
-		bio->bi_sector = page->index << (PAGE_SHIFT-9);
-		bio->bi_bdev = blkdev;
-	}
-
-	if(bio_add_page(bio, page, PAGE_SIZE, 0) != PAGE_SIZE) {
-		blkmtd_write_out(bio);
-		bio = NULL;
-		goto retry;
-	}
-	return bio;
-}
-
-
-/**
- * write_pages - write block of data to device via the page cache
- * @dev: device to write to
- * @buf: data source or NULL if erase (output is set to 0xff)
- * @to: offset into output device
- * @len: amount to data to write
- * @retlen: amount of data written
- *
- * Grab pages from the page cache and fill them with the source data.
- * Non page aligned start and end result in a readin of the page and
- * part of the page being modified. Pages are added to the bio and then written
- * out.
- */
-static int write_pages(struct blkmtd_dev *dev, const u_char *buf, loff_t to,
-		    size_t len, size_t *retlen)
-{
-	int pagenr, offset;
-	size_t start_len = 0, end_len;
-	int pagecnt = 0;
-	int err = 0;
-	struct bio *bio = NULL;
-	size_t thislen = 0;
-
-	pagenr = to >> PAGE_SHIFT;
-	offset = to & ~PAGE_MASK;
-
-	DEBUG(2, "blkmtd: write_pages: buf = %p to = %ld len = %zd pagenr = %d offset = %d\n",
-	      buf, (long)to, len, pagenr, offset);
-
-	/* see if we have to do a partial write at the start */
-	if(offset) {
-		start_len = ((offset + len) > PAGE_SIZE) ? PAGE_SIZE - offset : len;
-		len -= start_len;
-	}
-
-	/* calculate the length of the other two regions */
-	end_len = len & ~PAGE_MASK;
-	len -= end_len;
-
-	if(start_len)
-		pagecnt++;
-
-	if(len)
-		pagecnt += len >> PAGE_SHIFT;
-
-	if(end_len)
-		pagecnt++;
-
-	mutex_lock(&dev->wrbuf_mutex);
-
-	DEBUG(3, "blkmtd: write: start_len = %zd len = %zd end_len = %zd pagecnt = %d\n",
-	      start_len, len, end_len, pagecnt);
-
-	if(start_len) {
-		/* do partial start region */
-		struct page *page;
-
-		DEBUG(3, "blkmtd: write: doing partial start, page = %d len = %zd offset = %d\n",
-		      pagenr, start_len, offset);
-
-		BUG_ON(!buf);
-		page = read_cache_page(dev->blkdev->bd_inode->i_mapping, pagenr, (filler_t *)blkmtd_readpage, dev);
-		lock_page(page);
-		if(PageDirty(page)) {
-			err("to = %lld start_len = %zd len = %zd end_len = %zd pagenr = %d\n",
-			    to, start_len, len, end_len, pagenr);
-			BUG();
-		}
-		memcpy(page_address(page)+offset, buf, start_len);
-		set_page_dirty(page);
-		SetPageUptodate(page);
-		buf += start_len;
-		thislen = start_len;
-		bio = blkmtd_add_page(bio, dev->blkdev, page, pagecnt);
-		if(!bio) {
-			err = -ENOMEM;
-			err("bio_add_page failed\n");
-			goto write_err;
-		}
-		pagecnt--;
-		pagenr++;
-	}
-
-	/* Now do the main loop to a page aligned, n page sized output */
-	if(len) {
-		int pagesc = len >> PAGE_SHIFT;
-		DEBUG(3, "blkmtd: write: whole pages start = %d, count = %d\n",
-		      pagenr, pagesc);
-		while(pagesc) {
-			struct page *page;
-
-			/* see if page is in the page cache */
-			DEBUG(3, "blkmtd: write: grabbing page %d from page cache\n", pagenr);
-			page = grab_cache_page(dev->blkdev->bd_inode->i_mapping, pagenr);
-			if(PageDirty(page)) {
-				BUG();
-			}
-			if(!page) {
-				warn("write: cannot grab cache page %d", pagenr);
-				err = -ENOMEM;
-				goto write_err;
-			}
-			if(!buf) {
-				memset(page_address(page), 0xff, PAGE_SIZE);
-			} else {
-				memcpy(page_address(page), buf, PAGE_SIZE);
-				buf += PAGE_SIZE;
-			}
-			bio = blkmtd_add_page(bio, dev->blkdev, page, pagecnt);
-			if(!bio) {
-				err = -ENOMEM;
-				err("bio_add_page failed\n");
-				goto write_err;
-			}
-			pagenr++;
-			pagecnt--;
-			set_page_dirty(page);
-			SetPageUptodate(page);
-			pagesc--;
-			thislen += PAGE_SIZE;
-		}
-	}
-
-	if(end_len) {
-		/* do the third region */
-		struct page *page;
-		DEBUG(3, "blkmtd: write: doing partial end, page = %d len = %zd\n",
-		      pagenr, end_len);
-		BUG_ON(!buf);
-		page = read_cache_page(dev->blkdev->bd_inode->i_mapping, pagenr, (filler_t *)blkmtd_readpage, dev);
-		lock_page(page);
-		if(PageDirty(page)) {
-			err("to = %lld start_len = %zd len = %zd end_len = %zd pagenr = %d\n",
-			    to, start_len, len, end_len, pagenr);
-			BUG();
-		}
-		memcpy(page_address(page), buf, end_len);
-		set_page_dirty(page);
-		SetPageUptodate(page);
-		DEBUG(3, "blkmtd: write: writing out partial end\n");
-		thislen += end_len;
-		bio = blkmtd_add_page(bio, dev->blkdev, page, pagecnt);
-		if(!bio) {
-			err = -ENOMEM;
-			err("bio_add_page failed\n");
-			goto write_err;
-		}
-		pagenr++;
-	}
-
-	DEBUG(3, "blkmtd: write: got %d vectors to write\n", bio->bi_vcnt);
- write_err:
-	if(bio)
-		blkmtd_write_out(bio);
-
-	DEBUG(2, "blkmtd: write: end, retlen = %zd, err = %d\n", *retlen, err);
-	mutex_unlock(&dev->wrbuf_mutex);
-
-	if(retlen)
-		*retlen = thislen;
-	return err;
-}
-
-
-/* erase a specified part of the device */
-static int blkmtd_erase(struct mtd_info *mtd, struct erase_info *instr)
-{
-	struct blkmtd_dev *dev = mtd->priv;
-	struct mtd_erase_region_info *einfo = mtd->eraseregions;
-	int numregions = mtd->numeraseregions;
-	size_t from;
-	u_long len;
-	int err = -EIO;
-	size_t retlen;
-
-	instr->state = MTD_ERASING;
-	from = instr->addr;
-	len = instr->len;
-
-	/* check erase region has valid start and length */
-	DEBUG(2, "blkmtd: erase: dev = `%s' from = 0x%zx len = 0x%lx\n",
-	      mtd->name+9, from, len);
-	while(numregions) {
-		DEBUG(3, "blkmtd: checking erase region = 0x%08X size = 0x%X num = 0x%x\n",
-		      einfo->offset, einfo->erasesize, einfo->numblocks);
-		if(from >= einfo->offset
-		   && from < einfo->offset + (einfo->erasesize * einfo->numblocks)) {
-			if(len == einfo->erasesize
-			   && ( (from - einfo->offset) % einfo->erasesize == 0))
-				break;
-		}
-		numregions--;
-		einfo++;
-	}
-
-	if(!numregions) {
-		/* Not a valid erase block */
-		err("erase: invalid erase request 0x%lX @ 0x%08zX", len, from);
-		instr->state = MTD_ERASE_FAILED;
-		err = -EIO;
-	}
-
-	if(instr->state != MTD_ERASE_FAILED) {
-		/* do the erase */
-		DEBUG(3, "Doing erase from = %zd len = %ld\n", from, len);
-		err = write_pages(dev, NULL, from, len, &retlen);
-		if(err || retlen != len) {
-			err("erase failed err = %d", err);
-			instr->state = MTD_ERASE_FAILED;
-		} else {
-			instr->state = MTD_ERASE_DONE;
-		}
-	}
-
-	DEBUG(3, "blkmtd: erase: checking callback\n");
-	mtd_erase_callback(instr);
-	DEBUG(2, "blkmtd: erase: finished (err = %d)\n", err);
-	return err;
-}
-
-
-/* read a range of the data via the page cache */
-static int blkmtd_read(struct mtd_info *mtd, loff_t from, size_t len,
-		       size_t *retlen, u_char *buf)
-{
-	struct blkmtd_dev *dev = mtd->priv;
-	int err = 0;
-	int offset;
-	int pagenr, pages;
-	size_t thislen = 0;
-
-	DEBUG(2, "blkmtd: read: dev = `%s' from = %lld len = %zd buf = %p\n",
-	      mtd->name+9, from, len, buf);
-
-	if(from > mtd->size)
-		return -EINVAL;
-	if(from + len > mtd->size)
-		len = mtd->size - from;
-
-	pagenr = from >> PAGE_SHIFT;
-	offset = from - (pagenr << PAGE_SHIFT);
-
-	pages = (offset+len+PAGE_SIZE-1) >> PAGE_SHIFT;
-	DEBUG(3, "blkmtd: read: pagenr = %d offset = %d, pages = %d\n",
-	      pagenr, offset, pages);
-
-	while(pages) {
-		struct page *page;
-		int cpylen;
-
-		DEBUG(3, "blkmtd: read: looking for page: %d\n", pagenr);
-		page = read_cache_page(dev->blkdev->bd_inode->i_mapping, pagenr, (filler_t *)blkmtd_readpage, dev);
-		if(IS_ERR(page)) {
-			err = -EIO;
-			goto readerr;
-		}
-
-		cpylen = (PAGE_SIZE > len) ? len : PAGE_SIZE;
-		if(offset+cpylen > PAGE_SIZE)
-			cpylen = PAGE_SIZE-offset;
-
-		memcpy(buf + thislen, page_address(page) + offset, cpylen);
-		offset = 0;
-		len -= cpylen;
-		thislen += cpylen;
-		pagenr++;
-		pages--;
-		if(!PageDirty(page))
-			page_cache_release(page);
-	}
-
- readerr:
-	if(retlen)
-		*retlen = thislen;
-	DEBUG(2, "blkmtd: end read: retlen = %zd, err = %d\n", thislen, err);
-	return err;
-}
-
-
-/* write data to the underlying device */
-static int blkmtd_write(struct mtd_info *mtd, loff_t to, size_t len,
-			size_t *retlen, const u_char *buf)
-{
-	struct blkmtd_dev *dev = mtd->priv;
-	int err;
-
-	if(!len)
-		return 0;
-
-	DEBUG(2, "blkmtd: write: dev = `%s' to = %lld len = %zd buf = %p\n",
-	      mtd->name+9, to, len, buf);
-
-	if(to >= mtd->size) {
-		return -ENOSPC;
-	}
-
-	if(to + len > mtd->size) {
-		len = mtd->size - to;
-	}
-
-	err = write_pages(dev, buf, to, len, retlen);
-	if(err > 0)
-		err = 0;
-	DEBUG(2, "blkmtd: write: end, err = %d\n", err);
-	return err;
-}
-
-
-/* sync the device - wait until the write queue is empty */
-static void blkmtd_sync(struct mtd_info *mtd)
-{
-	/* Currently all writes are synchronous */
-}
-
-
-static void free_device(struct blkmtd_dev *dev)
-{
-	DEBUG(2, "blkmtd: free_device() dev = %p\n", dev);
-	if(dev) {
-		kfree(dev->mtd_info.eraseregions);
-		kfree(dev->mtd_info.name);
-		if(dev->blkdev) {
-			invalidate_inode_pages(dev->blkdev->bd_inode->i_mapping);
-			close_bdev_excl(dev->blkdev);
-		}
-		kfree(dev);
-	}
-}
-
-
-/* For a given size and initial erase size, calculate the number
- * and size of each erase region. Goes round the loop twice,
- * once to find out how many regions, then allocates space,
- * then round the loop again to fill it in.
- */
-static struct mtd_erase_region_info *calc_erase_regions(
-	size_t erase_size, size_t total_size, int *regions)
-{
-	struct mtd_erase_region_info *info = NULL;
-
-	DEBUG(2, "calc_erase_regions, es = %zd size = %zd regions = %d\n",
-	      erase_size, total_size, *regions);
-	/* Make any user specified erasesize be a power of 2
-	   and at least PAGE_SIZE */
-	if(erase_size) {
-		int es = erase_size;
-		erase_size = 1;
-		while(es != 1) {
-			es >>= 1;
-			erase_size <<= 1;
-		}
-		if(erase_size < PAGE_SIZE)
-			erase_size = PAGE_SIZE;
-	} else {
-		erase_size = CONFIG_MTD_BLKDEV_ERASESIZE;
-	}
-
-	*regions = 0;
-
-	do {
-		int tot_size = total_size;
-		int er_size = erase_size;
-		int count = 0, offset = 0, regcnt = 0;
-
-		while(tot_size) {
-			count = tot_size / er_size;
-			if(count) {
-				tot_size = tot_size % er_size;
-				if(info) {
-					DEBUG(2, "adding to erase info off=%d er=%d cnt=%d\n",
-					      offset, er_size, count);
-					(info+regcnt)->offset = offset;
-					(info+regcnt)->erasesize = er_size;
-					(info+regcnt)->numblocks = count;
-					(*regions)++;
-				}
-				regcnt++;
-				offset += (count * er_size);
-			}
-			while(er_size > tot_size)
-				er_size >>= 1;
-		}
-		if(info == NULL) {
-			info = kmalloc(regcnt * sizeof(struct mtd_erase_region_info), GFP_KERNEL);
-			if(!info)
-				break;
-		}
-	} while(!(*regions));
-	DEBUG(2, "calc_erase_regions done, es = %zd size = %zd regions = %d\n",
-	      erase_size, total_size, *regions);
-	return info;
-}
-
-
-static struct blkmtd_dev *add_device(char *devname, int readonly, int erase_size)
-{
-	struct block_device *bdev;
-	int mode;
-	struct blkmtd_dev *dev;
-
-	if(!devname)
-		return NULL;
-
-	/* Get a handle on the device */
-
-
-#ifdef MODULE
-	mode = (readonly) ? O_RDONLY : O_RDWR;
-	bdev = open_bdev_excl(devname, mode, NULL);
-#else
-	mode = (readonly) ? FMODE_READ : FMODE_WRITE;
-	bdev = open_by_devnum(name_to_dev_t(devname), mode);
-#endif
-	if(IS_ERR(bdev)) {
-		err("error: cannot open device %s", devname);
-		DEBUG(2, "blkmtd: opening bdev returned %ld\n", PTR_ERR(bdev));
-		return NULL;
-	}
-
-	DEBUG(1, "blkmtd: found a block device major = %d, minor = %d\n",
-	      MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
-
-	if(MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
-		err("attempting to use an MTD device as a block device");
-		blkdev_put(bdev);
-		return NULL;
-	}
-
-	dev = kmalloc(sizeof(struct blkmtd_dev), GFP_KERNEL);
-	if(dev == NULL) {
-		blkdev_put(bdev);
-		return NULL;
-	}
-
-	memset(dev, 0, sizeof(struct blkmtd_dev));
-	dev->blkdev = bdev;
-	if(!readonly) {
-		mutex_init(&dev->wrbuf_mutex);
-	}
-
-	dev->mtd_info.size = dev->blkdev->bd_inode->i_size & PAGE_MASK;
-
-	/* Setup the MTD structure */
-	/* make the name contain the block device in */
-	dev->mtd_info.name = kmalloc(sizeof("blkmtd: ") + strlen(devname), GFP_KERNEL);
-	if(dev->mtd_info.name == NULL)
-		goto devinit_err;
-
-	sprintf(dev->mtd_info.name, "blkmtd: %s", devname);
-	dev->mtd_info.eraseregions = calc_erase_regions(erase_size, dev->mtd_info.size,
-							&dev->mtd_info.numeraseregions);
-	if(dev->mtd_info.eraseregions == NULL)
-		goto devinit_err;
-
-	dev->mtd_info.erasesize = dev->mtd_info.eraseregions->erasesize;
-	DEBUG(1, "blkmtd: init: found %d erase regions\n",
-	      dev->mtd_info.numeraseregions);
-
-	if(readonly) {
-		dev->mtd_info.type = MTD_ROM;
-		dev->mtd_info.flags = MTD_CAP_ROM;
-	} else {
-		dev->mtd_info.type = MTD_RAM;
-		dev->mtd_info.flags = MTD_CAP_RAM;
-		dev->mtd_info.erase = blkmtd_erase;
-		dev->mtd_info.write = blkmtd_write;
-		dev->mtd_info.writev = default_mtd_writev;
-		dev->mtd_info.sync = blkmtd_sync;
-	}
-	dev->mtd_info.read = blkmtd_read;
-	dev->mtd_info.readv = default_mtd_readv;
-	dev->mtd_info.priv = dev;
-	dev->mtd_info.owner = THIS_MODULE;
-
-	list_add(&dev->list, &blkmtd_device_list);
-	if (add_mtd_device(&dev->mtd_info)) {
-		/* Device didnt get added, so free the entry */
-		list_del(&dev->list);
-		goto devinit_err;
-	} else {
-		info("mtd%d: [%s] erase_size = %dKiB %s",
-		     dev->mtd_info.index, dev->mtd_info.name + strlen("blkmtd: "),
-		     dev->mtd_info.erasesize >> 10,
-		     readonly ? "(read-only)" : "");
-	}
-
-	return dev;
-
- devinit_err:
-	free_device(dev);
-	return NULL;
-}
-
-
-/* Cleanup and exit - sync the device and kill of the kernel thread */
-static void __devexit cleanup_blkmtd(void)
-{
-	struct list_head *temp1, *temp2;
-
-	/* Remove the MTD devices */
-	list_for_each_safe(temp1, temp2, &blkmtd_device_list) {
-		struct blkmtd_dev *dev = list_entry(temp1, struct blkmtd_dev,
-						    list);
-		blkmtd_sync(&dev->mtd_info);
-		del_mtd_device(&dev->mtd_info);
-		info("mtd%d: [%s] removed", dev->mtd_info.index,
-		     dev->mtd_info.name + strlen("blkmtd: "));
-		list_del(&dev->list);
-		free_device(dev);
-	}
-}
-
-#ifndef MODULE
-
-/* Handle kernel boot params */
-
-
-static int __init param_blkmtd_device(char *str)
-{
-	int i;
-
-	for(i = 0; i < MAX_DEVICES; i++) {
-		device[i] = str;
-		DEBUG(2, "blkmtd: device setup: %d = %s\n", i, device[i]);
-		strsep(&str, ",");
-	}
-	return 1;
-}
-
-
-static int __init param_blkmtd_erasesz(char *str)
-{
-	int i;
-	for(i = 0; i < MAX_DEVICES; i++) {
-		char *val = strsep(&str, ",");
-		if(val)
-			erasesz[i] = simple_strtoul(val, NULL, 0);
-		DEBUG(2, "blkmtd: erasesz setup: %d = %d\n", i, erasesz[i]);
-	}
-
-	return 1;
-}
-
-
-static int __init param_blkmtd_ro(char *str)
-{
-	int i;
-	for(i = 0; i < MAX_DEVICES; i++) {
-		char *val = strsep(&str, ",");
-		if(val)
-			ro[i] = simple_strtoul(val, NULL, 0);
-		DEBUG(2, "blkmtd: ro setup: %d = %d\n", i, ro[i]);
-	}
-
-	return 1;
-}
-
-
-static int __init param_blkmtd_sync(char *str)
-{
-	if(str[0] == '1')
-		sync = 1;
-	return 1;
-}
-
-__setup("blkmtd_device=", param_blkmtd_device);
-__setup("blkmtd_erasesz=", param_blkmtd_erasesz);
-__setup("blkmtd_ro=", param_blkmtd_ro);
-__setup("blkmtd_sync=", param_blkmtd_sync);
-
-#endif
-
-
-/* Startup */
-static int __init init_blkmtd(void)
-{
-	int i;
-
-	info("version " VERSION);
-	/* Check args - device[0] is the bare minimum*/
-	if(!device[0]) {
-		err("error: missing `device' name\n");
-		return -EINVAL;
-	}
-
-	for(i = 0; i < MAX_DEVICES; i++)
-		add_device(device[i], ro[i], erasesz[i] << 10);
-
-	if(list_empty(&blkmtd_device_list))
-		return -EINVAL;
-
-	return 0;
-}
-
-module_init(init_blkmtd);
-module_exit(cleanup_blkmtd);