2005-04-16 16:20:36 -06:00
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/*
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2005-11-29 07:49:38 -07:00
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* $Id: block2mtd.c,v 1.30 2005/11/29 14:48:32 gleixner Exp $
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2005-04-16 16:20:36 -06:00
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*
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* block2mtd.c - create an mtd from a block device
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*
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* Copyright (C) 2001,2002 Simon Evans <spse@secret.org.uk>
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mtd: improve parameter parsing for block2mtd
Expand the parameter parsing for block2mtd. It now accepts:
Ki, Mi, Gi - the official prefixes for binary multiples,
see http://physics.nist.gov/cuu/Units/binary.html,
ki - mistake on my side and analog to "k" for decimal multiples,
KiB, MiB, GiB - for people that prefer to add a "B" for byte,
kiB - combination of the above.
There were complaints about not accepting "k" for 1024. This has long
been common practice, but is known to lead to confusion. Hence the new
SI units and hence block2mtd only accepts units that cannot be confused
with decimal units. Diverging from common practice doesn't always please
people, even if the change is for the better.
Signed-off-by: Joern Engel <joern@wohnheim.fh-wedel.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
2006-04-18 22:03:08 -06:00
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* Copyright (C) 2004-2006 J<EFBFBD>rn Engel <joern@wh.fh-wedel.de>
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2005-04-16 16:20:36 -06:00
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*
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* Licence: GPL
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/blkdev.h>
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#include <linux/bio.h>
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#include <linux/pagemap.h>
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#include <linux/list.h>
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#include <linux/init.h>
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#include <linux/mtd/mtd.h>
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#include <linux/buffer_head.h>
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2006-03-31 03:29:41 -07:00
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#include <linux/mutex.h>
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2005-04-16 16:20:36 -06:00
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2005-11-29 07:49:38 -07:00
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#define VERSION "$Revision: 1.30 $"
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2005-04-16 16:20:36 -06:00
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#define ERROR(fmt, args...) printk(KERN_ERR "block2mtd: " fmt "\n" , ## args)
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#define INFO(fmt, args...) printk(KERN_INFO "block2mtd: " fmt "\n" , ## args)
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/* Info for the block device */
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struct block2mtd_dev {
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struct list_head list;
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struct block_device *blkdev;
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struct mtd_info mtd;
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2006-03-31 03:29:41 -07:00
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struct mutex write_mutex;
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2005-04-16 16:20:36 -06:00
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};
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/* Static info about the MTD, used in cleanup_module */
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static LIST_HEAD(blkmtd_device_list);
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#define PAGE_READAHEAD 64
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2005-11-29 07:49:38 -07:00
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static void cache_readahead(struct address_space *mapping, int index)
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2005-04-16 16:20:36 -06:00
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{
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filler_t *filler = (filler_t*)mapping->a_ops->readpage;
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int i, pagei;
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unsigned ret = 0;
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unsigned long end_index;
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struct page *page;
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LIST_HEAD(page_pool);
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struct inode *inode = mapping->host;
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loff_t isize = i_size_read(inode);
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if (!isize) {
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INFO("iSize=0 in cache_readahead\n");
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return;
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}
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end_index = ((isize - 1) >> PAGE_CACHE_SHIFT);
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read_lock_irq(&mapping->tree_lock);
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for (i = 0; i < PAGE_READAHEAD; i++) {
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pagei = index + i;
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if (pagei > end_index) {
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INFO("Overrun end of disk in cache readahead\n");
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break;
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}
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page = radix_tree_lookup(&mapping->page_tree, pagei);
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if (page && (!i))
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break;
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if (page)
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continue;
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read_unlock_irq(&mapping->tree_lock);
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page = page_cache_alloc_cold(mapping);
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read_lock_irq(&mapping->tree_lock);
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if (!page)
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break;
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page->index = pagei;
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list_add(&page->lru, &page_pool);
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ret++;
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}
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read_unlock_irq(&mapping->tree_lock);
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if (ret)
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read_cache_pages(mapping, &page_pool, filler, NULL);
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}
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static struct page* page_readahead(struct address_space *mapping, int index)
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{
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filler_t *filler = (filler_t*)mapping->a_ops->readpage;
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cache_readahead(mapping, index);
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return read_cache_page(mapping, index, filler, NULL);
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}
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/* erase a specified part of the device */
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static int _block2mtd_erase(struct block2mtd_dev *dev, loff_t to, size_t len)
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{
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struct address_space *mapping = dev->blkdev->bd_inode->i_mapping;
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struct page *page;
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int index = to >> PAGE_SHIFT; // page index
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int pages = len >> PAGE_SHIFT;
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u_long *p;
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u_long *max;
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while (pages) {
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page = page_readahead(mapping, index);
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if (!page)
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return -ENOMEM;
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if (IS_ERR(page))
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return PTR_ERR(page);
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max = (u_long*)page_address(page) + PAGE_SIZE;
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2005-11-07 04:15:40 -07:00
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for (p=(u_long*)page_address(page); p<max; p++)
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2005-04-16 16:20:36 -06:00
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if (*p != -1UL) {
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lock_page(page);
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memset(page_address(page), 0xff, PAGE_SIZE);
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set_page_dirty(page);
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unlock_page(page);
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break;
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}
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page_cache_release(page);
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pages--;
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index++;
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}
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return 0;
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}
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static int block2mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
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{
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struct block2mtd_dev *dev = mtd->priv;
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size_t from = instr->addr;
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size_t len = instr->len;
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int err;
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instr->state = MTD_ERASING;
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2006-03-31 03:29:41 -07:00
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mutex_lock(&dev->write_mutex);
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2005-04-16 16:20:36 -06:00
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err = _block2mtd_erase(dev, from, len);
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2006-03-31 03:29:41 -07:00
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mutex_unlock(&dev->write_mutex);
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2005-04-16 16:20:36 -06:00
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if (err) {
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ERROR("erase failed err = %d", err);
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instr->state = MTD_ERASE_FAILED;
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} else
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instr->state = MTD_ERASE_DONE;
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instr->state = MTD_ERASE_DONE;
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mtd_erase_callback(instr);
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return err;
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}
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static int block2mtd_read(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, u_char *buf)
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{
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struct block2mtd_dev *dev = mtd->priv;
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struct page *page;
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int index = from >> PAGE_SHIFT;
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2005-03-07 13:29:09 -07:00
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int offset = from & (PAGE_SIZE-1);
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2005-04-16 16:20:36 -06:00
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int cpylen;
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if (from > mtd->size)
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return -EINVAL;
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if (from + len > mtd->size)
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len = mtd->size - from;
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if (retlen)
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*retlen = 0;
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while (len) {
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if ((offset + len) > PAGE_SIZE)
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cpylen = PAGE_SIZE - offset; // multiple pages
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else
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cpylen = len; // this page
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len = len - cpylen;
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// Get page
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page = page_readahead(dev->blkdev->bd_inode->i_mapping, index);
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if (!page)
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return -ENOMEM;
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if (IS_ERR(page))
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return PTR_ERR(page);
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memcpy(buf, page_address(page) + offset, cpylen);
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page_cache_release(page);
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if (retlen)
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*retlen += cpylen;
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buf += cpylen;
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offset = 0;
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index++;
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}
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return 0;
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}
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/* write data to the underlying device */
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static int _block2mtd_write(struct block2mtd_dev *dev, const u_char *buf,
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loff_t to, size_t len, size_t *retlen)
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{
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struct page *page;
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struct address_space *mapping = dev->blkdev->bd_inode->i_mapping;
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int index = to >> PAGE_SHIFT; // page index
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int offset = to & ~PAGE_MASK; // page offset
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int cpylen;
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if (retlen)
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*retlen = 0;
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while (len) {
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2005-11-07 04:15:40 -07:00
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if ((offset+len) > PAGE_SIZE)
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2005-04-16 16:20:36 -06:00
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cpylen = PAGE_SIZE - offset; // multiple pages
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else
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cpylen = len; // this page
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len = len - cpylen;
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// Get page
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page = page_readahead(mapping, index);
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if (!page)
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return -ENOMEM;
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if (IS_ERR(page))
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return PTR_ERR(page);
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if (memcmp(page_address(page)+offset, buf, cpylen)) {
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lock_page(page);
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memcpy(page_address(page) + offset, buf, cpylen);
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set_page_dirty(page);
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unlock_page(page);
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}
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page_cache_release(page);
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if (retlen)
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*retlen += cpylen;
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buf += cpylen;
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offset = 0;
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index++;
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}
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return 0;
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}
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static int block2mtd_write(struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf)
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{
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struct block2mtd_dev *dev = mtd->priv;
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int err;
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if (!len)
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return 0;
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if (to >= mtd->size)
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return -ENOSPC;
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if (to + len > mtd->size)
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len = mtd->size - to;
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2006-03-31 03:29:41 -07:00
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mutex_lock(&dev->write_mutex);
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2005-04-16 16:20:36 -06:00
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err = _block2mtd_write(dev, buf, to, len, retlen);
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2006-03-31 03:29:41 -07:00
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mutex_unlock(&dev->write_mutex);
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2005-04-16 16:20:36 -06:00
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if (err > 0)
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err = 0;
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return err;
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}
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/* sync the device - wait until the write queue is empty */
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static void block2mtd_sync(struct mtd_info *mtd)
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{
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struct block2mtd_dev *dev = mtd->priv;
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sync_blockdev(dev->blkdev);
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return;
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}
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static void block2mtd_free_device(struct block2mtd_dev *dev)
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{
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if (!dev)
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return;
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kfree(dev->mtd.name);
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if (dev->blkdev) {
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invalidate_inode_pages(dev->blkdev->bd_inode->i_mapping);
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close_bdev_excl(dev->blkdev);
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}
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kfree(dev);
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}
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/* FIXME: ensure that mtd->size % erase_size == 0 */
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static struct block2mtd_dev *add_device(char *devname, int erase_size)
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{
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struct block_device *bdev;
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struct block2mtd_dev *dev;
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if (!devname)
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return NULL;
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dev = kmalloc(sizeof(struct block2mtd_dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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memset(dev, 0, sizeof(*dev));
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/* Get a handle on the device */
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bdev = open_bdev_excl(devname, O_RDWR, NULL);
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if (IS_ERR(bdev)) {
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ERROR("error: cannot open device %s", devname);
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goto devinit_err;
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}
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dev->blkdev = bdev;
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if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
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ERROR("attempting to use an MTD device as a block device");
|
|
|
|
|
goto devinit_err;
|
|
|
|
|
}
|
|
|
|
|
|
2006-03-31 03:29:41 -07:00
|
|
|
|
mutex_init(&dev->write_mutex);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
|
|
|
|
/* Setup the MTD structure */
|
|
|
|
|
/* make the name contain the block device in */
|
|
|
|
|
dev->mtd.name = kmalloc(sizeof("block2mtd: ") + strlen(devname),
|
|
|
|
|
GFP_KERNEL);
|
|
|
|
|
if (!dev->mtd.name)
|
|
|
|
|
goto devinit_err;
|
|
|
|
|
|
|
|
|
|
sprintf(dev->mtd.name, "block2mtd: %s", devname);
|
|
|
|
|
|
|
|
|
|
dev->mtd.size = dev->blkdev->bd_inode->i_size & PAGE_MASK;
|
|
|
|
|
dev->mtd.erasesize = erase_size;
|
|
|
|
|
dev->mtd.type = MTD_RAM;
|
|
|
|
|
dev->mtd.flags = MTD_CAP_RAM;
|
|
|
|
|
dev->mtd.erase = block2mtd_erase;
|
|
|
|
|
dev->mtd.write = block2mtd_write;
|
|
|
|
|
dev->mtd.writev = default_mtd_writev;
|
|
|
|
|
dev->mtd.sync = block2mtd_sync;
|
|
|
|
|
dev->mtd.read = block2mtd_read;
|
|
|
|
|
dev->mtd.readv = default_mtd_readv;
|
|
|
|
|
dev->mtd.priv = dev;
|
|
|
|
|
dev->mtd.owner = THIS_MODULE;
|
|
|
|
|
|
|
|
|
|
if (add_mtd_device(&dev->mtd)) {
|
|
|
|
|
/* Device didnt get added, so free the entry */
|
|
|
|
|
goto devinit_err;
|
|
|
|
|
}
|
|
|
|
|
list_add(&dev->list, &blkmtd_device_list);
|
|
|
|
|
INFO("mtd%d: [%s] erase_size = %dKiB [%d]", dev->mtd.index,
|
|
|
|
|
dev->mtd.name + strlen("blkmtd: "),
|
|
|
|
|
dev->mtd.erasesize >> 10, dev->mtd.erasesize);
|
|
|
|
|
return dev;
|
|
|
|
|
|
|
|
|
|
devinit_err:
|
|
|
|
|
block2mtd_free_device(dev);
|
|
|
|
|
return NULL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
mtd: improve parameter parsing for block2mtd
Expand the parameter parsing for block2mtd. It now accepts:
Ki, Mi, Gi - the official prefixes for binary multiples,
see http://physics.nist.gov/cuu/Units/binary.html,
ki - mistake on my side and analog to "k" for decimal multiples,
KiB, MiB, GiB - for people that prefer to add a "B" for byte,
kiB - combination of the above.
There were complaints about not accepting "k" for 1024. This has long
been common practice, but is known to lead to confusion. Hence the new
SI units and hence block2mtd only accepts units that cannot be confused
with decimal units. Diverging from common practice doesn't always please
people, even if the change is for the better.
Signed-off-by: Joern Engel <joern@wohnheim.fh-wedel.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
2006-04-18 22:03:08 -06:00
|
|
|
|
/* This function works similar to reguler strtoul. In addition, it
|
|
|
|
|
* allows some suffixes for a more human-readable number format:
|
|
|
|
|
* ki, Ki, kiB, KiB - multiply result with 1024
|
|
|
|
|
* Mi, MiB - multiply result with 1024^2
|
|
|
|
|
* Gi, GiB - multiply result with 1024^3
|
|
|
|
|
*/
|
2005-04-16 16:20:36 -06:00
|
|
|
|
static int ustrtoul(const char *cp, char **endp, unsigned int base)
|
|
|
|
|
{
|
|
|
|
|
unsigned long result = simple_strtoul(cp, endp, base);
|
|
|
|
|
switch (**endp) {
|
|
|
|
|
case 'G' :
|
|
|
|
|
result *= 1024;
|
|
|
|
|
case 'M':
|
|
|
|
|
result *= 1024;
|
mtd: improve parameter parsing for block2mtd
Expand the parameter parsing for block2mtd. It now accepts:
Ki, Mi, Gi - the official prefixes for binary multiples,
see http://physics.nist.gov/cuu/Units/binary.html,
ki - mistake on my side and analog to "k" for decimal multiples,
KiB, MiB, GiB - for people that prefer to add a "B" for byte,
kiB - combination of the above.
There were complaints about not accepting "k" for 1024. This has long
been common practice, but is known to lead to confusion. Hence the new
SI units and hence block2mtd only accepts units that cannot be confused
with decimal units. Diverging from common practice doesn't always please
people, even if the change is for the better.
Signed-off-by: Joern Engel <joern@wohnheim.fh-wedel.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
2006-04-18 22:03:08 -06:00
|
|
|
|
case 'K':
|
2005-04-16 16:20:36 -06:00
|
|
|
|
case 'k':
|
|
|
|
|
result *= 1024;
|
|
|
|
|
/* By dwmw2 editorial decree, "ki", "Mi" or "Gi" are to be used. */
|
mtd: improve parameter parsing for block2mtd
Expand the parameter parsing for block2mtd. It now accepts:
Ki, Mi, Gi - the official prefixes for binary multiples,
see http://physics.nist.gov/cuu/Units/binary.html,
ki - mistake on my side and analog to "k" for decimal multiples,
KiB, MiB, GiB - for people that prefer to add a "B" for byte,
kiB - combination of the above.
There were complaints about not accepting "k" for 1024. This has long
been common practice, but is known to lead to confusion. Hence the new
SI units and hence block2mtd only accepts units that cannot be confused
with decimal units. Diverging from common practice doesn't always please
people, even if the change is for the better.
Signed-off-by: Joern Engel <joern@wohnheim.fh-wedel.de>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
2006-04-18 22:03:08 -06:00
|
|
|
|
if ((*endp)[1] == 'i') {
|
|
|
|
|
if ((*endp)[2] == 'B')
|
|
|
|
|
(*endp) += 3;
|
|
|
|
|
else
|
|
|
|
|
(*endp) += 2;
|
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
}
|
|
|
|
|
return result;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
2005-03-19 15:40:47 -07:00
|
|
|
|
static int parse_num(size_t *num, const char *token)
|
2005-04-16 16:20:36 -06:00
|
|
|
|
{
|
|
|
|
|
char *endp;
|
2005-03-19 15:40:47 -07:00
|
|
|
|
size_t n;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
|
2005-03-19 15:40:47 -07:00
|
|
|
|
n = (size_t) ustrtoul(token, &endp, 0);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
if (*endp)
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
2005-03-19 15:40:47 -07:00
|
|
|
|
*num = n;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static int parse_name(char **pname, const char *token, size_t limit)
|
|
|
|
|
{
|
|
|
|
|
size_t len;
|
|
|
|
|
char *name;
|
|
|
|
|
|
|
|
|
|
len = strlen(token) + 1;
|
|
|
|
|
if (len > limit)
|
|
|
|
|
return -ENOSPC;
|
|
|
|
|
|
|
|
|
|
name = kmalloc(len, GFP_KERNEL);
|
|
|
|
|
if (!name)
|
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
|
|
strcpy(name, token);
|
|
|
|
|
|
|
|
|
|
*pname = name;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static inline void kill_final_newline(char *str)
|
|
|
|
|
{
|
|
|
|
|
char *newline = strrchr(str, '\n');
|
|
|
|
|
if (newline && !newline[1])
|
|
|
|
|
*newline = 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#define parse_err(fmt, args...) do { \
|
|
|
|
|
ERROR("block2mtd: " fmt "\n", ## args); \
|
|
|
|
|
return 0; \
|
|
|
|
|
} while (0)
|
|
|
|
|
|
|
|
|
|
static int block2mtd_setup(const char *val, struct kernel_param *kp)
|
|
|
|
|
{
|
2006-05-13 17:42:25 -06:00
|
|
|
|
char buf[80+12]; /* 80 for device, 12 for erase size */
|
|
|
|
|
char *str = buf;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
char *token[2];
|
|
|
|
|
char *name;
|
2005-03-19 15:40:47 -07:00
|
|
|
|
size_t erase_size = PAGE_SIZE;
|
2005-04-16 16:20:36 -06:00
|
|
|
|
int i, ret;
|
|
|
|
|
|
|
|
|
|
if (strnlen(val, sizeof(buf)) >= sizeof(buf))
|
|
|
|
|
parse_err("parameter too long");
|
|
|
|
|
|
|
|
|
|
strcpy(str, val);
|
|
|
|
|
kill_final_newline(str);
|
|
|
|
|
|
2006-05-13 17:42:25 -06:00
|
|
|
|
for (i = 0; i < 2; i++)
|
2005-04-16 16:20:36 -06:00
|
|
|
|
token[i] = strsep(&str, ",");
|
|
|
|
|
|
|
|
|
|
if (str)
|
|
|
|
|
parse_err("too many arguments");
|
|
|
|
|
|
|
|
|
|
if (!token[0])
|
|
|
|
|
parse_err("no argument");
|
|
|
|
|
|
|
|
|
|
ret = parse_name(&name, token[0], 80);
|
|
|
|
|
if (ret == -ENOMEM)
|
|
|
|
|
parse_err("out of memory");
|
|
|
|
|
if (ret == -ENOSPC)
|
|
|
|
|
parse_err("name too long");
|
|
|
|
|
if (ret)
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
|
|
if (token[1]) {
|
2005-03-19 15:40:47 -07:00
|
|
|
|
ret = parse_num(&erase_size, token[1]);
|
2006-05-13 17:42:25 -06:00
|
|
|
|
if (ret) {
|
|
|
|
|
kfree(name);
|
2005-04-16 16:20:36 -06:00
|
|
|
|
parse_err("illegal erase size");
|
2006-05-13 17:42:25 -06:00
|
|
|
|
}
|
2005-04-16 16:20:36 -06:00
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
add_device(name, erase_size);
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
module_param_call(block2mtd, block2mtd_setup, NULL, NULL, 0200);
|
|
|
|
|
MODULE_PARM_DESC(block2mtd, "Device to use. \"block2mtd=<dev>[,<erasesize>]\"");
|
|
|
|
|
|
|
|
|
|
static int __init block2mtd_init(void)
|
|
|
|
|
{
|
|
|
|
|
INFO("version " VERSION);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
static void __devexit block2mtd_exit(void)
|
|
|
|
|
{
|
|
|
|
|
struct list_head *pos, *next;
|
|
|
|
|
|
|
|
|
|
/* Remove the MTD devices */
|
|
|
|
|
list_for_each_safe(pos, next, &blkmtd_device_list) {
|
|
|
|
|
struct block2mtd_dev *dev = list_entry(pos, typeof(*dev), list);
|
|
|
|
|
block2mtd_sync(&dev->mtd);
|
|
|
|
|
del_mtd_device(&dev->mtd);
|
|
|
|
|
INFO("mtd%d: [%s] removed", dev->mtd.index,
|
|
|
|
|
dev->mtd.name + strlen("blkmtd: "));
|
|
|
|
|
list_del(&dev->list);
|
|
|
|
|
block2mtd_free_device(dev);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
module_init(block2mtd_init);
|
|
|
|
|
module_exit(block2mtd_exit);
|
|
|
|
|
|
|
|
|
|
MODULE_LICENSE("GPL");
|
|
|
|
|
MODULE_AUTHOR("Simon Evans <spse@secret.org.uk> and others");
|
|
|
|
|
MODULE_DESCRIPTION("Emulate an MTD using a block device");
|