diff options
Diffstat (limited to 'drivers/mtd/devices/blkmtd.c')
| -rw-r--r-- | drivers/mtd/devices/blkmtd.c | 823 |
1 files changed, 823 insertions, 0 deletions
diff --git a/drivers/mtd/devices/blkmtd.c b/drivers/mtd/devices/blkmtd.c new file mode 100644 index 00000000000..662e807801e --- /dev/null +++ b/drivers/mtd/devices/blkmtd.c @@ -0,0 +1,823 @@ +/* + * $Id: blkmtd.c,v 1.24 2004/11/16 18:29:01 dwmw2 Exp $ + * + * blkmtd.c - use a block device as a fake MTD + * + * Author: Simon Evans <spse@secret.org.uk> + * + * 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/mtd/mtd.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: 1.24 $" + +/* Info for the block device */ +struct blkmtd_dev { + struct list_head list; + struct block_device *blkdev; + struct mtd_info mtd_info; + struct semaphore 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 <spse@secret.org.uk>"); +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); + } + ClearPageDirty(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++; + + down(&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); + SetPageDirty(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--; + SetPageDirty(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); + SetPageDirty(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); + up(&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) { + if(dev->mtd_info.eraseregions) + kfree(dev->mtd_info.eraseregions); + if(dev->mtd_info.name) + 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; +} + + +extern dev_t __init name_to_dev_t(const char *line); + +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) { + init_MUTEX(&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); |