/*
- * Character-device access to raw MTD devices.
+ * Copyright © 1999-2010 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/smp_lock.h>
#include <linux/backing-dev.h>
#include <linux/compat.h>
+#include <linux/mount.h>
#include <linux/mtd/mtd.h>
-#include <linux/mtd/compatmac.h>
+#include <linux/mtd/map.h>
#include <asm/uaccess.h>
+#define MTD_INODE_FS_MAGIC 0x11307854
+static struct vfsmount *mtd_inode_mnt __read_mostly;
/*
* Data structure to hold the pointer to the mtd device as well
*/
struct mtd_file_info {
struct mtd_info *mtd;
+ struct inode *ino;
enum mtd_file_modes mode;
};
int ret = 0;
struct mtd_info *mtd;
struct mtd_file_info *mfi;
+ struct inode *mtd_ino;
DEBUG(MTD_DEBUG_LEVEL0, "MTD_open\n");
- if (devnum >= MAX_MTD_DEVICES)
- return -ENODEV;
-
/* You can't open the RO devices RW */
if ((file->f_mode & FMODE_WRITE) && (minor & 1))
return -EACCES;
goto out;
}
- if (mtd->backing_dev_info)
- file->f_mapping->backing_dev_info = mtd->backing_dev_info;
+ mtd_ino = iget_locked(mtd_inode_mnt->mnt_sb, devnum);
+ if (!mtd_ino) {
+ put_mtd_device(mtd);
+ ret = -ENOMEM;
+ goto out;
+ }
+ if (mtd_ino->i_state & I_NEW) {
+ mtd_ino->i_private = mtd;
+ mtd_ino->i_mode = S_IFCHR;
+ mtd_ino->i_data.backing_dev_info = mtd->backing_dev_info;
+ unlock_new_inode(mtd_ino);
+ }
+ file->f_mapping = mtd_ino->i_mapping;
/* You can't open it RW if it's not a writeable device */
if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
+ iput(mtd_ino);
put_mtd_device(mtd);
ret = -EACCES;
goto out;
mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
if (!mfi) {
+ iput(mtd_ino);
put_mtd_device(mtd);
ret = -ENOMEM;
goto out;
}
+ mfi->ino = mtd_ino;
mfi->mtd = mtd;
file->private_data = mfi;
if ((file->f_mode & FMODE_WRITE) && mtd->sync)
mtd->sync(mtd);
+ iput(mfi->ino);
+
put_mtd_device(mtd);
file->private_data = NULL;
kfree(mfi);
if (!mtd->write_oob)
ret = -EOPNOTSUPP;
else
- ret = access_ok(VERIFY_READ, ptr, length) ? 0 : EFAULT;
+ ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
if (ret)
return ret;
if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
return -EINVAL;
- ops.oobbuf = kmalloc(length, GFP_KERNEL);
- if (!ops.oobbuf)
- return -ENOMEM;
-
- if (copy_from_user(ops.oobbuf, ptr, length)) {
- kfree(ops.oobbuf);
- return -EFAULT;
- }
+ ops.oobbuf = memdup_user(ptr, length);
+ if (IS_ERR(ops.oobbuf))
+ return PTR_ERR(ops.oobbuf);
start &= ~((uint64_t)mtd->oobsize - 1);
ret = mtd->write_oob(mtd, start, &ops);
{
uint32_t ur_idx;
struct mtd_erase_region_info *kr;
- struct region_info_user *ur = (struct region_info_user *) argp;
+ struct region_info_user __user *ur = argp;
if (get_user(ur_idx, &(ur->regionindex)))
return -EFAULT;
break;
}
+ case MEMISLOCKED:
+ {
+ struct erase_info_user einfo;
+
+ if (copy_from_user(&einfo, argp, sizeof(einfo)))
+ return -EFAULT;
+
+ if (!mtd->is_locked)
+ ret = -EOPNOTSUPP;
+ else
+ ret = mtd->is_locked(mtd, einfo.start, einfo.length);
+ break;
+ }
+
/* Legacy interface */
case MEMGETOOBSEL:
{
#ifdef CONFIG_MMU
struct mtd_file_info *mfi = file->private_data;
struct mtd_info *mtd = mfi->mtd;
+ struct map_info *map = mtd->priv;
+ unsigned long start;
+ unsigned long off;
+ u32 len;
+
+ if (mtd->type == MTD_RAM || mtd->type == MTD_ROM) {
+ off = vma->vm_pgoff << PAGE_SHIFT;
+ start = map->phys;
+ len = PAGE_ALIGN((start & ~PAGE_MASK) + map->size);
+ start &= PAGE_MASK;
+ if ((vma->vm_end - vma->vm_start + off) > len)
+ return -EINVAL;
+
+ off += start;
+ vma->vm_pgoff = off >> PAGE_SHIFT;
+ vma->vm_flags |= VM_IO | VM_RESERVED;
+
+#ifdef pgprot_noncached
+ if (file->f_flags & O_DSYNC || off >= __pa(high_memory))
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+#endif
+ if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
+ vma->vm_end - vma->vm_start,
+ vma->vm_page_prot))
+ return -EAGAIN;
- if (mtd->type == MTD_RAM || mtd->type == MTD_ROM)
return 0;
+ }
return -ENOSYS;
#else
return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
#endif
};
+static int mtd_inodefs_get_sb(struct file_system_type *fs_type, int flags,
+ const char *dev_name, void *data,
+ struct vfsmount *mnt)
+{
+ return get_sb_pseudo(fs_type, "mtd_inode:", NULL, MTD_INODE_FS_MAGIC,
+ mnt);
+}
+
+static struct file_system_type mtd_inodefs_type = {
+ .name = "mtd_inodefs",
+ .get_sb = mtd_inodefs_get_sb,
+ .kill_sb = kill_anon_super,
+};
+
+static void mtdchar_notify_add(struct mtd_info *mtd)
+{
+}
+
+static void mtdchar_notify_remove(struct mtd_info *mtd)
+{
+ struct inode *mtd_ino = ilookup(mtd_inode_mnt->mnt_sb, mtd->index);
+
+ if (mtd_ino) {
+ /* Destroy the inode if it exists */
+ mtd_ino->i_nlink = 0;
+ iput(mtd_ino);
+ }
+}
+
+static struct mtd_notifier mtdchar_notifier = {
+ .add = mtdchar_notify_add,
+ .remove = mtdchar_notify_remove,
+};
+
static int __init init_mtdchar(void)
{
- int status;
+ int ret;
- status = register_chrdev(MTD_CHAR_MAJOR, "mtd", &mtd_fops);
- if (status < 0) {
- printk(KERN_NOTICE "Can't allocate major number %d for Memory Technology Devices.\n",
- MTD_CHAR_MAJOR);
+ ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
+ "mtd", &mtd_fops);
+ if (ret < 0) {
+ pr_notice("Can't allocate major number %d for "
+ "Memory Technology Devices.\n", MTD_CHAR_MAJOR);
+ return ret;
}
- return status;
+ ret = register_filesystem(&mtd_inodefs_type);
+ if (ret) {
+ pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
+ goto err_unregister_chdev;
+ }
+
+ mtd_inode_mnt = kern_mount(&mtd_inodefs_type);
+ if (IS_ERR(mtd_inode_mnt)) {
+ ret = PTR_ERR(mtd_inode_mnt);
+ pr_notice("Error mounting mtd_inodefs filesystem: %d\n", ret);
+ goto err_unregister_filesystem;
+ }
+ register_mtd_user(&mtdchar_notifier);
+
+ return ret;
+
+err_unregister_filesystem:
+ unregister_filesystem(&mtd_inodefs_type);
+err_unregister_chdev:
+ __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
+ return ret;
}
static void __exit cleanup_mtdchar(void)
{
- unregister_chrdev(MTD_CHAR_MAJOR, "mtd");
+ unregister_mtd_user(&mtdchar_notifier);
+ mntput(mtd_inode_mnt);
+ unregister_filesystem(&mtd_inodefs_type);
+ __unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
}
module_init(init_mtdchar);
git://bbs.cooldavid.org / net-next-2.6.git / blobdiff