/*
* get a superblock on an MTD-backed filesystem by MTD device number
*/
static int get_sb_mtd_nr(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data, int mtdnr,
int (*fill_super)(struct super_block *, void *, int),
struct vfsmount *mnt)
{
struct mtd_info *mtd;
mtd = get_mtd_device(NULL, mtdnr);
if (IS_ERR(mtd)) {
DEBUG(0, "MTDSB: Device #%u doesn't appear to exist\n", mtdnr);
return PTR_ERR(mtd);
}
return get_sb_mtd_aux(fs_type, flags, dev_name, data, mtd, fill_super,
mnt);
}
/*
* set up an MTD-based superblock
*/
int get_sb_mtd(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data,
int (*fill_super)(struct super_block *, void *, int),
struct vfsmount *mnt)
{
#ifdef CONFIG_BLOCK
struct block_device *bdev;
int ret, major;
#endif
int mtdnr;
if (!dev_name)
return -EINVAL;
DEBUG(2, "MTDSB: dev_name \"%s\"\n", dev_name);
/* the preferred way of mounting in future; especially when
* CONFIG_BLOCK=n - we specify the underlying MTD device by number or
* by name, so that we don't require block device support to be present
* in the kernel. */
if (dev_name[0] == 'm' && dev_name[1] == 't' && dev_name[2] == 'd') {
if (dev_name[3] == ':') {
struct mtd_info *mtd;
/* mount by MTD device name */
DEBUG(1, "MTDSB: mtd:%%s, name \"%s\"\n",
dev_name + 4);
mtd = get_mtd_device_nm(dev_name + 4);
if (!IS_ERR(mtd))
return get_sb_mtd_aux(
fs_type, flags,
dev_name, data, mtd,
fill_super, mnt);
printk(KERN_NOTICE "MTD:"
" MTD device with name \"%s\" not found.\n",
dev_name + 4);
} else if (isdigit(dev_name[3])) {
/* mount by MTD device number name */
char *endptr;
mtdnr = simple_strtoul(dev_name + 3, &endptr, 0);
if (!*endptr) {
/* It was a valid number */
DEBUG(1, "MTDSB: mtd%%d, mtdnr %d\n",
mtdnr);
return get_sb_mtd_nr(fs_type, flags,
dev_name, data,
mtdnr, fill_super, mnt);
}
}
}
#ifdef CONFIG_BLOCK
/* try the old way - the hack where we allowed users to mount
* /dev/mtdblock$(n) but didn't actually _use_ the blockdev
*/
bdev = lookup_bdev(dev_name);
if (IS_ERR(bdev)) {
ret = PTR_ERR(bdev);
DEBUG(1, "MTDSB: lookup_bdev() returned %d\n", ret);
return ret;
}
DEBUG(1, "MTDSB: lookup_bdev() returned 0\n");
ret = -EINVAL;
major = MAJOR(bdev->bd_dev);
mtdnr = MINOR(bdev->bd_dev);
bdput(bdev);
if (major != MTD_BLOCK_MAJOR)
goto not_an_MTD_device;
return get_sb_mtd_nr(fs_type, flags, dev_name, data, mtdnr, fill_super,
mnt);
not_an_MTD_device:
#endif /* CONFIG_BLOCK */
if (!(flags & MS_SILENT))
printk(KERN_NOTICE
"MTD: Attempt to mount non-MTD device \"%s\"\n",
dev_name);
return -EINVAL;
}
int get_sb_mtd(struct file_system_type *fs_type, int flags,
const char *dev_name, void *data,
int (*fill_super)(struct super_block *, void *, int),
struct vfsmount *mnt)
{
#ifdef CONFIG_BLOCK
struct block_device *bdev;
int ret, major;
#endif
int mtdnr;
if (!dev_name)
return -EINVAL;
DEBUG(2, "MTDSB: dev_name \"%s\"\n", dev_name);
if (dev_name[0] == 'm' && dev_name[1] == 't' && dev_name[2] == 'd') {
if (dev_name[3] == ':') {
struct mtd_info *mtd;
DEBUG(1, "MTDSB: mtd:%%s, name \"%s\"\n",
dev_name + 4);
for (mtdnr = 0; mtdnr < MAX_MTD_DEVICES; mtdnr++) {
mtd = get_mtd_device(NULL, mtdnr);
if (!IS_ERR(mtd)) {
if (!strcmp(mtd->name, dev_name + 4))
return get_sb_mtd_aux(
fs_type, flags,
dev_name, data, mtd,
fill_super, mnt);
put_mtd_device(mtd);
}
}
printk(KERN_NOTICE "MTD:"
" MTD device with name \"%s\" not found.\n",
dev_name + 4);
} else if (isdigit(dev_name[3])) {
char *endptr;
mtdnr = simple_strtoul(dev_name + 3, &endptr, 0);
if (!*endptr) {
DEBUG(1, "MTDSB: mtd%%d, mtdnr %d\n",
mtdnr);
return get_sb_mtd_nr(fs_type, flags,
dev_name, data,
mtdnr, fill_super, mnt);
}
}
}
#ifdef CONFIG_BLOCK
bdev = lookup_bdev(dev_name);
if (IS_ERR(bdev)) {
ret = PTR_ERR(bdev);
DEBUG(1, "MTDSB: lookup_bdev() returned %d\n", ret);
return ret;
}
DEBUG(1, "MTDSB: lookup_bdev() returned 0\n");
ret = -EINVAL;
major = MAJOR(bdev->bd_dev);
mtdnr = MINOR(bdev->bd_dev);
bdput(bdev);
if (major != MTD_BLOCK_MAJOR)
goto not_an_MTD_device;
return get_sb_mtd_nr(fs_type, flags, dev_name, data, mtdnr, fill_super,
mnt);
not_an_MTD_device:
#endif
if (!(flags & MS_SILENT))
printk(KERN_NOTICE
"MTD: Attempt to mount non-MTD device \"%s\"\n",
dev_name);
return -EINVAL;
}