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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/mtd/mtdblock_ro.c | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/mtd/mtdblock_ro.c')
-rw-r--r-- | kernel/drivers/mtd/mtdblock_ro.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/kernel/drivers/mtd/mtdblock_ro.c b/kernel/drivers/mtd/mtdblock_ro.c new file mode 100644 index 000000000..fb5dc8936 --- /dev/null +++ b/kernel/drivers/mtd/mtdblock_ro.c @@ -0,0 +1,99 @@ +/* + * Simple read-only (writable only for RAM) mtdblock driver + * + * Copyright © 2001-2010 David Woodhouse <dwmw2@infradead.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + * + */ + +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/blktrans.h> +#include <linux/module.h> +#include <linux/major.h> + +static int mtdblock_readsect(struct mtd_blktrans_dev *dev, + unsigned long block, char *buf) +{ + size_t retlen; + + if (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 (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 = kzalloc(sizeof(*dev), GFP_KERNEL); + + if (!dev) + return; + + dev->mtd = mtd; + dev->devnum = mtd->index; + + dev->size = mtd->size >> 9; + dev->tr = tr; + dev->readonly = 1; + + if (add_mtd_blktrans_dev(dev)) + kfree(dev); +} + +static void mtdblock_remove_dev(struct mtd_blktrans_dev *dev) +{ + del_mtd_blktrans_dev(dev); +} + +static struct mtd_blktrans_ops mtdblock_tr = { + .name = "mtdblock", + .major = MTD_BLOCK_MAJOR, + .part_bits = 0, + .blksize = 512, + .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"); |