#include <linux/sched.h>
#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 <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);
# define otp_select_filemode(f,m) -EOPNOTSUPP
#endif
-static int mtd_ioctl(struct inode *inode, struct file *file,
- u_int cmd, u_long arg)
+static int mtd_do_writeoob(struct file *file, struct mtd_info *mtd,
+ uint64_t start, uint32_t length, void __user *ptr,
+ uint32_t __user *retp)
+{
+ struct mtd_oob_ops ops;
+ uint32_t retlen;
+ int ret = 0;
+
+ if (!(file->f_mode & FMODE_WRITE))
+ return -EPERM;
+
+ if (length > 4096)
+ return -EINVAL;
+
+ if (!mtd->write_oob)
+ ret = -EOPNOTSUPP;
+ else
+ ret = access_ok(VERIFY_READ, ptr, length) ? 0 : -EFAULT;
+
+ if (ret)
+ return ret;
+
+ ops.ooblen = length;
+ ops.ooboffs = start & (mtd->oobsize - 1);
+ ops.datbuf = NULL;
+ ops.mode = MTD_OOB_PLACE;
+
+ if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
+ return -EINVAL;
+
+ 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);
+
+ if (ops.oobretlen > 0xFFFFFFFFU)
+ ret = -EOVERFLOW;
+ retlen = ops.oobretlen;
+ if (copy_to_user(retp, &retlen, sizeof(length)))
+ ret = -EFAULT;
+
+ kfree(ops.oobbuf);
+ return ret;
+}
+
+static int mtd_do_readoob(struct mtd_info *mtd, uint64_t start,
+ uint32_t length, void __user *ptr, uint32_t __user *retp)
+{
+ struct mtd_oob_ops ops;
+ int ret = 0;
+
+ 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;
+
+ ops.ooblen = length;
+ ops.ooboffs = start & (mtd->oobsize - 1);
+ ops.datbuf = NULL;
+ ops.mode = MTD_OOB_PLACE;
+
+ if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
+ return -EINVAL;
+
+ ops.oobbuf = kmalloc(length, GFP_KERNEL);
+ if (!ops.oobbuf)
+ return -ENOMEM;
+
+ start &= ~((uint64_t)mtd->oobsize - 1);
+ ret = mtd->read_oob(mtd, start, &ops);
+
+ if (put_user(ops.oobretlen, retp))
+ ret = -EFAULT;
+ else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
+ ops.oobretlen))
+ ret = -EFAULT;
+
+ kfree(ops.oobbuf);
+ return ret;
+}
+
+static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
{
struct mtd_file_info *mfi = file->private_data;
struct mtd_info *mtd = mfi->mtd;
{
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;
case MEMWRITEOOB:
{
struct mtd_oob_buf buf;
- struct mtd_oob_ops ops;
- struct mtd_oob_buf __user *user_buf = argp;
- uint32_t retlen;
-
- if(!(file->f_mode & FMODE_WRITE))
- return -EPERM;
-
- if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
- return -EFAULT;
-
- if (buf.length > 4096)
- return -EINVAL;
-
- if (!mtd->write_oob)
- ret = -EOPNOTSUPP;
- else
- ret = access_ok(VERIFY_READ, buf.ptr,
- buf.length) ? 0 : EFAULT;
-
- if (ret)
- return ret;
-
- ops.ooblen = buf.length;
- ops.ooboffs = buf.start & (mtd->oobsize - 1);
- ops.datbuf = NULL;
- ops.mode = MTD_OOB_PLACE;
-
- if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
- return -EINVAL;
-
- ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
- if (!ops.oobbuf)
- return -ENOMEM;
-
- if (copy_from_user(ops.oobbuf, buf.ptr, buf.length)) {
- kfree(ops.oobbuf);
- return -EFAULT;
- }
-
- buf.start &= ~(mtd->oobsize - 1);
- ret = mtd->write_oob(mtd, buf.start, &ops);
+ struct mtd_oob_buf __user *buf_user = argp;
- if (ops.oobretlen > 0xFFFFFFFFU)
- ret = -EOVERFLOW;
- retlen = ops.oobretlen;
- if (copy_to_user(&user_buf->length, &retlen, sizeof(buf.length)))
+ /* NOTE: writes return length to buf_user->length */
+ if (copy_from_user(&buf, argp, sizeof(buf)))
ret = -EFAULT;
-
- kfree(ops.oobbuf);
+ else
+ ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
+ buf.ptr, &buf_user->length);
break;
-
}
case MEMREADOOB:
{
struct mtd_oob_buf buf;
- struct mtd_oob_ops ops;
+ struct mtd_oob_buf __user *buf_user = argp;
- if (copy_from_user(&buf, argp, sizeof(struct mtd_oob_buf)))
- return -EFAULT;
-
- if (buf.length > 4096)
- return -EINVAL;
-
- if (!mtd->read_oob)
- ret = -EOPNOTSUPP;
+ /* NOTE: writes return length to buf_user->start */
+ if (copy_from_user(&buf, argp, sizeof(buf)))
+ ret = -EFAULT;
else
- ret = access_ok(VERIFY_WRITE, buf.ptr,
- buf.length) ? 0 : -EFAULT;
- if (ret)
- return ret;
-
- ops.ooblen = buf.length;
- ops.ooboffs = buf.start & (mtd->oobsize - 1);
- ops.datbuf = NULL;
- ops.mode = MTD_OOB_PLACE;
+ ret = mtd_do_readoob(mtd, buf.start, buf.length,
+ buf.ptr, &buf_user->start);
+ break;
+ }
- if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
- return -EINVAL;
+ case MEMWRITEOOB64:
+ {
+ struct mtd_oob_buf64 buf;
+ struct mtd_oob_buf64 __user *buf_user = argp;
- ops.oobbuf = kmalloc(buf.length, GFP_KERNEL);
- if (!ops.oobbuf)
- return -ENOMEM;
+ if (copy_from_user(&buf, argp, sizeof(buf)))
+ ret = -EFAULT;
+ else
+ ret = mtd_do_writeoob(file, mtd, buf.start, buf.length,
+ (void __user *)(uintptr_t)buf.usr_ptr,
+ &buf_user->length);
+ break;
+ }
- buf.start &= ~(mtd->oobsize - 1);
- ret = mtd->read_oob(mtd, buf.start, &ops);
+ case MEMREADOOB64:
+ {
+ struct mtd_oob_buf64 buf;
+ struct mtd_oob_buf64 __user *buf_user = argp;
- if (put_user(ops.oobretlen, (uint32_t __user *)argp))
- ret = -EFAULT;
- else if (ops.oobretlen && copy_to_user(buf.ptr, ops.oobbuf,
- ops.oobretlen))
+ if (copy_from_user(&buf, argp, sizeof(buf)))
ret = -EFAULT;
-
- kfree(ops.oobbuf);
+ else
+ ret = mtd_do_readoob(mtd, buf.start, buf.length,
+ (void __user *)(uintptr_t)buf.usr_ptr,
+ &buf_user->length);
break;
}
return ret;
} /* memory_ioctl */
+static long mtd_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
+{
+ int ret;
+
+ lock_kernel();
+ ret = mtd_ioctl(file, cmd, arg);
+ unlock_kernel();
+
+ return ret;
+}
+
+#ifdef CONFIG_COMPAT
+
+struct mtd_oob_buf32 {
+ u_int32_t start;
+ u_int32_t length;
+ compat_caddr_t ptr; /* unsigned char* */
+};
+
+#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,
+ unsigned long arg)
+{
+ struct mtd_file_info *mfi = file->private_data;
+ struct mtd_info *mtd = mfi->mtd;
+ void __user *argp = compat_ptr(arg);
+ int ret = 0;
+
+ lock_kernel();
+
+ switch (cmd) {
+ case MEMWRITEOOB32:
+ {
+ struct mtd_oob_buf32 buf;
+ struct mtd_oob_buf32 __user *buf_user = argp;
+
+ if (copy_from_user(&buf, argp, sizeof(buf)))
+ ret = -EFAULT;
+ else
+ ret = mtd_do_writeoob(file, mtd, buf.start,
+ buf.length, compat_ptr(buf.ptr),
+ &buf_user->length);
+ break;
+ }
+
+ case MEMREADOOB32:
+ {
+ struct mtd_oob_buf32 buf;
+ struct mtd_oob_buf32 __user *buf_user = argp;
+
+ /* NOTE: writes return length to buf->start */
+ if (copy_from_user(&buf, argp, sizeof(buf)))
+ ret = -EFAULT;
+ else
+ ret = mtd_do_readoob(mtd, buf.start,
+ buf.length, compat_ptr(buf.ptr),
+ &buf_user->start);
+ break;
+ }
+ default:
+ ret = mtd_ioctl(file, cmd, (unsigned long)argp);
+ }
+
+ unlock_kernel();
+
+ return ret;
+}
+
+#endif /* CONFIG_COMPAT */
+
/*
* try to determine where a shared mapping can be made
* - only supported for NOMMU at the moment (MMU can't doesn't copy private
.llseek = mtd_lseek,
.read = mtd_read,
.write = mtd_write,
- .ioctl = mtd_ioctl,
+ .unlocked_ioctl = mtd_unlocked_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = mtd_compat_ioctl,
+#endif
.open = mtd_open,
.release = mtd_close,
.mmap = mtd_mmap,
#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;
+
+ 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;
+ }
- 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_filesystem(&mtd_inodefs_type);
+ if (ret) {
+ pr_notice("Can't register mtd_inodefs filesystem: %d\n", ret);
+ goto err_unregister_chdev;
}
- return status;
+ 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://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff