block_device_t *block_device_find(block_device_t *_prev)
{
LinkedList *ptr;
if(_prev == NULL)
ptr = bdev_list.next;
else
ptr = &_prev->list_ptr;
if(ptr == &bdev_list)
return NULL;
return bdev_get(ptr);
}
static int ext4_check_fs_type(const char *bdev_name)
{
struct ext4_super_block *e4_sb;
struct bio *bio;
char buff[EXT4_SUPER_BLK_SIZE];
struct block_device *bdev;
uint32_t fc, frc, fi;
int ret;
bdev = bdev_get(bdev_name);
if (NULL == bdev) {
DPRINT("bdev %s not found!\n", bdev_name);
return -ENODEV;
}
bio = bio_alloc();
if (!bio)
return -ENOMEM;
bio->bdev = bdev;
bio->sect = 1024 / SECT_SIZE;
bio->size = sizeof(buff);
bio->data = buff;
submit_bio(READ, bio);
// TODO: check flags here
bio_free(bio);
e4_sb = (struct ext4_super_block *)buff;
if (0xEF53 != e4_sb->s_magic) {
DPRINT("%s is not \"ext4\" fs!\n", bdev_name);
return -EINVAL;
}
fc = e4_sb->s_feature_compat;
fi = e4_sb->s_feature_incompat;
frc = e4_sb->s_feature_ro_compat;
ret = ck_ext4_feature(fc, frc, fi);
#ifdef CONFIG_DEBUG
extern void ext_sb_list(struct ext4_super_block * esb);
if (ret == 0) {
ext_sb_list(e4_sb);
}
#endif
return ret;
}
