#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
return -EINVAL;
}
-
+static int count;
+static struct vfsmount *mnt;
+static struct file_system_type mtd_inodefs_type;
static int mtdchar_open(struct inode *inode, struct file *file)
{
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;
} /* mtdchar_open */
pr_debug("MTD_close\n");
/* Only sync if opened RW */
- if ((file->f_mode & FMODE_WRITE) && mtd->sync)
+ 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;
} /* mtdchar_close */
{
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;
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);
break;
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;
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;
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);
!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;
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);
break;
}
break;
case MTD_FILE_MODE_RAW:
- if (!mtd->read_oob || !mtd->write_oob)
+ if (!mtd_has_oob(mtd))
return -EOPNOTSUPP;
mfi->mode = arg;
{
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
#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 */
- clear_nlink(mtd_ino);
- 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");
}
projects / linux-flexiantxendom0-3.2.10.git / blobdiff