From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- drivers/mtd/mtdblock_ro.c | 87 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 87 insertions(+) create mode 100644 drivers/mtd/mtdblock_ro.c (limited to 'drivers/mtd/mtdblock_ro.c') diff --git a/drivers/mtd/mtdblock_ro.c b/drivers/mtd/mtdblock_ro.c new file mode 100644 index 00000000000..0c830ba41ef --- /dev/null +++ b/drivers/mtd/mtdblock_ro.c @@ -0,0 +1,87 @@ +/* + * $Id: mtdblock_ro.c,v 1.19 2004/11/16 18:28:59 dwmw2 Exp $ + * + * (C) 2003 David Woodhouse + * + * Simple read-only (writable only for RAM) mtdblock driver + */ + +#include +#include +#include +#include + +static int mtdblock_readsect(struct mtd_blktrans_dev *dev, + unsigned long block, char *buf) +{ + size_t retlen; + + if (dev->mtd->read(dev->mtd, (block * 512), 512, &retlen, buf)) + return 1; + return 0; +} + +static int mtdblock_writesect(struct mtd_blktrans_dev *dev, + unsigned long block, char *buf) +{ + size_t retlen; + + if (dev->mtd->write(dev->mtd, (block * 512), 512, &retlen, buf)) + return 1; + return 0; +} + +static void mtdblock_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd) +{ + struct mtd_blktrans_dev *dev = kmalloc(sizeof(*dev), GFP_KERNEL); + + if (!dev) + return; + + memset(dev, 0, sizeof(*dev)); + + dev->mtd = mtd; + dev->devnum = mtd->index; + dev->blksize = 512; + dev->size = mtd->size >> 9; + dev->tr = tr; + if ((mtd->flags & (MTD_CLEAR_BITS|MTD_SET_BITS|MTD_WRITEABLE)) != + (MTD_CLEAR_BITS|MTD_SET_BITS|MTD_WRITEABLE)) + dev->readonly = 1; + + add_mtd_blktrans_dev(dev); +} + +static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev) +{ + del_mtd_blktrans_dev(dev); + kfree(dev); +} + +static struct mtd_blktrans_ops mtdblock_tr = { + .name = "mtdblock", + .major = 31, + .part_bits = 0, + .readsect = mtdblock_readsect, + .writesect = mtdblock_writesect, + .add_mtd = mtdblock_add_mtd, + .remove_dev = mtdblock_remove_dev, + .owner = THIS_MODULE, +}; + +static int __init mtdblock_init(void) +{ + return register_mtd_blktrans(&mtdblock_tr); +} + +static void __exit mtdblock_exit(void) +{ + deregister_mtd_blktrans(&mtdblock_tr); +} + +module_init(mtdblock_init); +module_exit(mtdblock_exit); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("David Woodhouse "); +MODULE_DESCRIPTION("Simple read-only block device emulation access to MTD devices"); -- cgit v1.2.3