#include <linux/compat.h>
#include <linux/mount.h>
#include <linux/blkpg.h>
+#include <linux/magic.h>
#include <linux/mtd/mtd.h>
#include <linux/mtd/partitions.h>
#include <linux/mtd/map.h>
#include <asm/uaccess.h>
-#define MTD_INODE_FS_MAGIC 0x11307854
static DEFINE_MUTEX(mtd_mutex);
-static struct vfsmount *mtd_inode_mnt __read_mostly;
/*
* Data structure to hold the pointer to the mtd device as well
enum mtd_file_modes mode;
};
-static loff_t mtd_lseek (struct file *file, loff_t offset, int orig)
+static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
{
struct mtd_file_info *mfi = file->private_data;
struct mtd_info *mtd = mfi->mtd;
return -EINVAL;
}
+static int count;
+static struct vfsmount *mnt;
+static struct file_system_type mtd_inodefs_type;
-
-static int mtd_open(struct inode *inode, struct file *file)
+static int mtdchar_open(struct inode *inode, struct file *file)
{
int minor = iminor(inode);
int devnum = minor >> 1;
if ((file->f_mode & FMODE_WRITE) && (minor & 1))
return -EACCES;
+ ret = simple_pin_fs(&mtd_inodefs_type, &mnt, &count);
+ if (ret)
+ return ret;
+
mutex_lock(&mtd_mutex);
mtd = get_mtd_device(NULL, devnum);
}
if (mtd->type == MTD_ABSENT) {
- put_mtd_device(mtd);
ret = -ENODEV;
- goto out;
+ goto out1;
}
- mtd_ino = iget_locked(mtd_inode_mnt->mnt_sb, devnum);
+ mtd_ino = iget_locked(mnt->mnt_sb, devnum);
if (!mtd_ino) {
- put_mtd_device(mtd);
ret = -ENOMEM;
- goto out;
+ goto out1;
}
if (mtd_ino->i_state & I_NEW) {
mtd_ino->i_private = mtd;
/* 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;
+ goto out2;
}
mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
if (!mfi) {
- iput(mtd_ino);
- put_mtd_device(mtd);
ret = -ENOMEM;
- goto out;
+ goto out2;
}
mfi->ino = mtd_ino;
mfi->mtd = mtd;
file->private_data = mfi;
+ mutex_unlock(&mtd_mutex);
+ return 0;
+out2:
+ iput(mtd_ino);
+out1:
+ put_mtd_device(mtd);
out:
mutex_unlock(&mtd_mutex);
+ simple_release_fs(&mnt, &count);
return ret;
-} /* mtd_open */
+} /* mtdchar_open */
/*====================================================================*/
-static int mtd_close(struct inode *inode, struct file *file)
+static int mtdchar_close(struct inode *inode, struct file *file)
{
struct mtd_file_info *mfi = file->private_data;
struct mtd_info *mtd = mfi->mtd;
pr_debug("MTD_close\n");
/* Only sync if opened RW */
- if ((file->f_mode & FMODE_WRITE) && mtd->sync)
- mtd->sync(mtd);
+ if ((file->f_mode & FMODE_WRITE))
+ mtd_sync(mtd);
iput(mfi->ino);
put_mtd_device(mtd);
file->private_data = NULL;
kfree(mfi);
+ simple_release_fs(&mnt, &count);
return 0;
-} /* mtd_close */
+} /* mtdchar_close */
/* Back in June 2001, dwmw2 wrote:
*
* alignment requirements are not met in the NAND subdriver.
*/
-static ssize_t mtd_read(struct file *file, char __user *buf, size_t count,loff_t *ppos)
+static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
+ loff_t *ppos)
{
struct mtd_file_info *mfi = file->private_data;
struct mtd_info *mtd = mfi->mtd;
- size_t retlen=0;
+ size_t retlen;
size_t total_retlen=0;
int ret=0;
int len;
switch (mfi->mode) {
case MTD_FILE_MODE_OTP_FACTORY:
- ret = mtd->read_fact_prot_reg(mtd, *ppos, len, &retlen, kbuf);
+ ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
+ &retlen, kbuf);
break;
case MTD_FILE_MODE_OTP_USER:
- ret = mtd->read_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
+ ret = mtd_read_user_prot_reg(mtd, *ppos, len,
+ &retlen, kbuf);
break;
case MTD_FILE_MODE_RAW:
{
ops.oobbuf = NULL;
ops.len = len;
- ret = mtd->read_oob(mtd, *ppos, &ops);
+ ret = mtd_read_oob(mtd, *ppos, &ops);
retlen = ops.retlen;
break;
}
default:
- ret = mtd->read(mtd, *ppos, len, &retlen, kbuf);
+ ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
}
/* Nand returns -EBADMSG on ECC errors, but it returns
* the data. For our userspace tools it is important
* Userspace software which accesses NAND this way
* must be aware of the fact that it deals with NAND
*/
- if (!ret || (ret == -EUCLEAN) || (ret == -EBADMSG)) {
+ if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
*ppos += retlen;
if (copy_to_user(buf, kbuf, retlen)) {
kfree(kbuf);
kfree(kbuf);
return total_retlen;
-} /* mtd_read */
+} /* mtdchar_read */
-static ssize_t mtd_write(struct file *file, const char __user *buf, size_t count,loff_t *ppos)
+static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
+ loff_t *ppos)
{
struct mtd_file_info *mfi = file->private_data;
struct mtd_info *mtd = mfi->mtd;
ret = -EROFS;
break;
case MTD_FILE_MODE_OTP_USER:
- if (!mtd->write_user_prot_reg) {
- ret = -EOPNOTSUPP;
- break;
- }
- ret = mtd->write_user_prot_reg(mtd, *ppos, len, &retlen, kbuf);
+ ret = mtd_write_user_prot_reg(mtd, *ppos, len,
+ &retlen, kbuf);
break;
case MTD_FILE_MODE_RAW:
ops.ooboffs = 0;
ops.len = len;
- ret = mtd->write_oob(mtd, *ppos, &ops);
+ ret = mtd_write_oob(mtd, *ppos, &ops);
retlen = ops.retlen;
break;
}
default:
- ret = (*(mtd->write))(mtd, *ppos, len, &retlen, kbuf);
+ ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
}
if (!ret) {
*ppos += retlen;
kfree(kbuf);
return total_retlen;
-} /* mtd_write */
+} /* mtdchar_write */
/*======================================================================
static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
{
struct mtd_info *mtd = mfi->mtd;
+ size_t retlen;
int ret = 0;
+ /*
+ * Make a fake call to mtd_read_fact_prot_reg() to check if OTP
+ * operations are supported.
+ */
+ if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) == -EOPNOTSUPP)
+ return -EOPNOTSUPP;
+
switch (mode) {
case MTD_OTP_FACTORY:
- if (!mtd->read_fact_prot_reg)
- ret = -EOPNOTSUPP;
- else
- mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
+ mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
break;
case MTD_OTP_USER:
- if (!mtd->read_fact_prot_reg)
- ret = -EOPNOTSUPP;
- else
- mfi->mode = MTD_FILE_MODE_OTP_USER;
+ mfi->mode = MTD_FILE_MODE_OTP_USER;
break;
default:
ret = -EINVAL;
# define otp_select_filemode(f,m) -EOPNOTSUPP
#endif
-static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd,
+static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
uint64_t start, uint32_t length, void __user *ptr,
uint32_t __user *retp)
{
if (length > 4096)
return -EINVAL;
- if (!mtd->write_oob)
+ if (!mtd->_write_oob)
ret = -EOPNOTSUPP;
else
ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
return PTR_ERR(ops.oobbuf);
start &= ~((uint64_t)mtd->writesize - 1);
- ret = mtd->write_oob(mtd, start, &ops);
+ ret = mtd_write_oob(mtd, start, &ops);
if (ops.oobretlen > 0xFFFFFFFFU)
ret = -EOVERFLOW;
return ret;
}
-static int mtd_do_readoob(struct file *file, struct mtd_info *mtd,
+static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
uint64_t start, uint32_t length, void __user *ptr,
uint32_t __user *retp)
{
if (length > 4096)
return -EINVAL;
- if (!mtd->read_oob)
- ret = -EOPNOTSUPP;
- else
- ret = access_ok(VERIFY_WRITE, ptr,
- length) ? 0 : -EFAULT;
- if (ret)
- return ret;
+ if (!access_ok(VERIFY_WRITE, ptr, length))
+ return -EFAULT;
ops.ooblen = length;
ops.ooboffs = start & (mtd->writesize - 1);
return -ENOMEM;
start &= ~((uint64_t)mtd->writesize - 1);
- ret = mtd->read_oob(mtd, start, &ops);
+ ret = mtd_read_oob(mtd, start, &ops);
if (put_user(ops.oobretlen, retp))
ret = -EFAULT;
* does not calculate ECC for the OOB area, so do not rely on
* this behavior unless you have replaced it with your own.
*/
- if (ret == -EUCLEAN || ret == -EBADMSG)
+ if (mtd_is_bitflip_or_eccerr(ret))
return 0;
return ret;
return 0;
}
-static int mtd_blkpg_ioctl(struct mtd_info *mtd,
+static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
struct blkpg_ioctl_arg __user *arg)
{
struct blkpg_ioctl_arg a;
}
}
-static int mtd_write_ioctl(struct mtd_info *mtd,
+static int mtdchar_write_ioctl(struct mtd_info *mtd,
struct mtd_write_req __user *argp)
{
struct mtd_write_req req;
!access_ok(VERIFY_READ, req.usr_data, req.len) ||
!access_ok(VERIFY_READ, req.usr_oob, req.ooblen))
return -EFAULT;
- if (!mtd->write_oob)
+ if (!mtd->_write_oob)
return -EOPNOTSUPP;
ops.mode = req.mode;
ops.oobbuf = NULL;
}
- ret = mtd->write_oob(mtd, (loff_t)req.start, &ops);
+ ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
kfree(ops.datbuf);
kfree(ops.oobbuf);
return ret;
}
-static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
+static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
{
struct mtd_file_info *mfi = file->private_data;
struct mtd_info *mtd = mfi->mtd;
info.erasesize = mtd->erasesize;
info.writesize = mtd->writesize;
info.oobsize = mtd->oobsize;
- /* The below fields are obsolete */
- info.ecctype = -1;
+ /* The below field is obsolete */
+ info.padding = 0;
if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
return -EFAULT;
break;
wq_head is no longer there when the
callback routine tries to wake us up.
*/
- ret = mtd->erase(mtd, erase);
+ ret = mtd_erase(mtd, erase);
if (!ret) {
set_current_state(TASK_UNINTERRUPTIBLE);
add_wait_queue(&waitq, &wait);
if (copy_from_user(&buf, argp, sizeof(buf)))
ret = -EFAULT;
else
- ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
+ ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
buf.ptr, &buf_user->length);
break;
}
if (copy_from_user(&buf, argp, sizeof(buf)))
ret = -EFAULT;
else
- ret = mtd_do_readoob(file, mtd, buf.start, buf.length,
+ ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
buf.ptr, &buf_user->start);
break;
}
if (copy_from_user(&buf, argp, sizeof(buf)))
ret = -EFAULT;
else
- ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
+ ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
(void __user *)(uintptr_t)buf.usr_ptr,
&buf_user->length);
break;
if (copy_from_user(&buf, argp, sizeof(buf)))
ret = -EFAULT;
else
- ret = mtd_do_readoob(file, mtd, buf.start, buf.length,
+ ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
(void __user *)(uintptr_t)buf.usr_ptr,
&buf_user->length);
break;
case MEMWRITE:
{
- ret = mtd_write_ioctl(mtd,
+ ret = mtdchar_write_ioctl(mtd,
(struct mtd_write_req __user *)arg);
break;
}
if (copy_from_user(&einfo, argp, sizeof(einfo)))
return -EFAULT;
- if (!mtd->lock)
- ret = -EOPNOTSUPP;
- else
- ret = mtd->lock(mtd, einfo.start, einfo.length);
+ ret = mtd_lock(mtd, einfo.start, einfo.length);
break;
}
if (copy_from_user(&einfo, argp, sizeof(einfo)))
return -EFAULT;
- if (!mtd->unlock)
- ret = -EOPNOTSUPP;
- else
- ret = mtd->unlock(mtd, einfo.start, einfo.length);
+ ret = mtd_unlock(mtd, einfo.start, einfo.length);
break;
}
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);
+ ret = mtd_is_locked(mtd, einfo.start, einfo.length);
break;
}
if (copy_from_user(&offs, argp, sizeof(loff_t)))
return -EFAULT;
- if (!mtd->block_isbad)
- ret = -EOPNOTSUPP;
- else
- return mtd->block_isbad(mtd, offs);
+ return mtd_block_isbad(mtd, offs);
break;
}
if (copy_from_user(&offs, argp, sizeof(loff_t)))
return -EFAULT;
- if (!mtd->block_markbad)
- ret = -EOPNOTSUPP;
- else
- return mtd->block_markbad(mtd, offs);
+ return mtd_block_markbad(mtd, offs);
break;
}
struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
if (!buf)
return -ENOMEM;
- ret = -EOPNOTSUPP;
switch (mfi->mode) {
case MTD_FILE_MODE_OTP_FACTORY:
- if (mtd->get_fact_prot_info)
- ret = mtd->get_fact_prot_info(mtd, buf, 4096);
+ ret = mtd_get_fact_prot_info(mtd, buf, 4096);
break;
case MTD_FILE_MODE_OTP_USER:
- if (mtd->get_user_prot_info)
- ret = mtd->get_user_prot_info(mtd, buf, 4096);
+ ret = mtd_get_user_prot_info(mtd, buf, 4096);
break;
default:
+ ret = -EINVAL;
break;
}
if (ret >= 0) {
return -EINVAL;
if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
return -EFAULT;
- if (!mtd->lock_user_prot_reg)
- return -EOPNOTSUPP;
- ret = mtd->lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
+ ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
break;
}
#endif
break;
case MTD_FILE_MODE_RAW:
- if (!mtd->read_oob || !mtd->write_oob)
+ if (!mtd_has_oob(mtd))
return -EOPNOTSUPP;
mfi->mode = arg;
case BLKPG:
{
- ret = mtd_blkpg_ioctl(mtd,
+ ret = mtdchar_blkpg_ioctl(mtd,
(struct blkpg_ioctl_arg __user *)arg);
break;
}
return ret;
} /* memory_ioctl */
-static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
+static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
{
int ret;
mutex_lock(&mtd_mutex);
- ret = mtd_ioctl(file, cmd, arg);
+ ret = mtdchar_ioctl(file, cmd, arg);
mutex_unlock(&mtd_mutex);
return ret;
#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
-static long mtd_compat_ioctl(struct file *file, unsigned int cmd,
+static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct mtd_file_info *mfi = file->private_data;
if (copy_from_user(&buf, argp, sizeof(buf)))
ret = -EFAULT;
else
- ret = mtd_do_writeoob(file, mtd, buf.start,
+ ret = mtdchar_writeoob(file, mtd, buf.start,
buf.length, compat_ptr(buf.ptr),
&buf_user->length);
break;
if (copy_from_user(&buf, argp, sizeof(buf)))
ret = -EFAULT;
else
- ret = mtd_do_readoob(file, mtd, buf.start,
+ ret = mtdchar_readoob(file, mtd, buf.start,
buf.length, compat_ptr(buf.ptr),
&buf_user->start);
break;
}
default:
- ret = mtd_ioctl(file, cmd, (unsigned long)argp);
+ ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
}
mutex_unlock(&mtd_mutex);
* mappings)
*/
#ifndef CONFIG_MMU
-static unsigned long mtd_get_unmapped_area(struct file *file,
+static unsigned long mtdchar_get_unmapped_area(struct file *file,
unsigned long addr,
unsigned long len,
unsigned long pgoff,
{
struct mtd_file_info *mfi = file->private_data;
struct mtd_info *mtd = mfi->mtd;
+ unsigned long offset;
+ int ret;
- if (mtd->get_unmapped_area) {
- unsigned long offset;
-
- if (addr != 0)
- return (unsigned long) -EINVAL;
-
- if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
- return (unsigned long) -EINVAL;
+ if (addr != 0)
+ return (unsigned long) -EINVAL;
- offset = pgoff << PAGE_SHIFT;
- if (offset > mtd->size - len)
- return (unsigned long) -EINVAL;
+ if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
+ return (unsigned long) -EINVAL;
- return mtd->get_unmapped_area(mtd, len, offset, flags);
- }
+ offset = pgoff << PAGE_SHIFT;
+ if (offset > mtd->size - len)
+ return (unsigned long) -EINVAL;
- /* can't map directly */
- return (unsigned long) -ENOSYS;
+ ret = mtd_get_unmapped_area(mtd, len, offset, flags);
+ return ret == -EOPNOTSUPP ? -ENOSYS : ret;
}
#endif
/*
* set up a mapping for shared memory segments
*/
-static int mtd_mmap(struct file *file, struct vm_area_struct *vma)
+static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
{
#ifdef CONFIG_MMU
struct mtd_file_info *mfi = file->private_data;
static const struct file_operations mtd_fops = {
.owner = THIS_MODULE,
- .llseek = mtd_lseek,
- .read = mtd_read,
- .write = mtd_write,
- .unlocked_ioctl = mtd_unlocked_ioctl,
+ .llseek = mtdchar_lseek,
+ .read = mtdchar_read,
+ .write = mtdchar_write,
+ .unlocked_ioctl = mtdchar_unlocked_ioctl,
#ifdef CONFIG_COMPAT
- .compat_ioctl = mtd_compat_ioctl,
+ .compat_ioctl = mtdchar_compat_ioctl,
#endif
- .open = mtd_open,
- .release = mtd_close,
- .mmap = mtd_mmap,
+ .open = mtdchar_open,
+ .release = mtdchar_close,
+ .mmap = mtdchar_mmap,
#ifndef CONFIG_MMU
- .get_unmapped_area = mtd_get_unmapped_area,
+ .get_unmapped_area = mtdchar_get_unmapped_area,
#endif
};
+static const struct super_operations mtd_ops = {
+ .drop_inode = generic_delete_inode,
+ .statfs = simple_statfs,
+};
+
static struct dentry *mtd_inodefs_mount(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data)
{
- return mount_pseudo(fs_type, "mtd_inode:", NULL, NULL, MTD_INODE_FS_MAGIC);
+ return mount_pseudo(fs_type, "mtd_inode:", &mtd_ops, NULL, MTD_INODE_FS_MAGIC);
}
static struct file_system_type mtd_inodefs_type = {
.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 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_mtd_user(&mtdchar_notifier);
- kern_unmount(mtd_inode_mnt);
unregister_filesystem(&mtd_inodefs_type);
__unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
}