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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/mtd/mtdblock_ro.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-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!
Diffstat (limited to 'drivers/mtd/mtdblock_ro.c')
-rw-r--r-- | drivers/mtd/mtdblock_ro.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/drivers/mtd/mtdblock_ro.c b/drivers/mtd/mtdblock_ro.c new file mode 100644 index 000000000000..0c830ba41ef0 --- /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 <dwmw2@infradead.org> + * + * Simple read-only (writable only for RAM) mtdblock driver + */ + +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/blktrans.h> + +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 <dwmw2@infradead.org>"); +MODULE_DESCRIPTION("Simple read-only block device emulation access to MTD devices"); |