#define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
#define NILFS_BTREE_LEVEL_MAX 14
+/* nilfs 1st super block posission from beginning of the partition
+ in 512 block size */
+#define NILFS_1ST_SUPER_BLOCK 2
+/* nilfs 2nd super block posission from end of the partition
+ in 512 block size */
+#define NILFS_2ND_SUPER_BLOCK 8
+
struct grub_nilfs2_inode
{
grub_uint64_t i_blocks;
return 1;
}
+static grub_err_t
+grub_nilfs2_load_sb (struct grub_nilfs2_data *data)
+{
+ grub_disk_t disk = data->disk;
+ struct grub_nilfs2_super_block sb2;
+ grub_uint64_t partition_size;
+ int valid[2];
+ int swp = 0;
+
+ /* Read first super block. */
+ grub_disk_read (disk, NILFS_1ST_SUPER_BLOCK, 0,
+ sizeof (struct grub_nilfs2_super_block), &data->sblock);
+ /* Make sure if 1st super block is valid. */
+ valid[0] = grub_nilfs2_valid_sb (&data->sblock);
+
+ partition_size = grub_disk_get_size (disk);
+ if (partition_size != GRUB_DISK_SIZE_UNKNOWN)
+ {
+ /* Read second super block. */
+ grub_disk_read (disk, partition_size - NILFS_2ND_SUPER_BLOCK, 0,
+ sizeof (struct grub_nilfs2_super_block), &sb2);
+ /* Make sure if 2nd super block is valid. */
+ valid[1] = grub_nilfs2_valid_sb (&sb2);
+ }
+ else
+ /* 2nd super block may not exist, so it's invalid. */
+ valid[1] = 0;
+
+
+
+ if (!valid[0] && !valid[1])
+ return grub_error (GRUB_ERR_BAD_FS, "not a nilfs2 filesystem");
+
+ swp = valid[1] && (!valid[0] ||
+ grub_le_to_cpu64 (data->sblock.s_last_cno) <
+ grub_le_to_cpu64 (sb2.s_last_cno));
+
+ /* swap if first super block is invalid or older than second one. */
+ if (swp)
+ grub_memcpy (&data->sblock, &sb2,
+ sizeof (struct grub_nilfs2_super_block));
+
+ grub_errno = GRUB_ERR_NONE;
+ return grub_errno;
+}
+
static struct grub_nilfs2_data *
grub_nilfs2_mount (grub_disk_t disk)
{
if (!data)
return 0;
+ data->disk = disk;
+
/* Read the superblock. */
- grub_disk_read (disk, 1 * 2, 0, sizeof (struct grub_nilfs2_super_block),
- &data->sblock);
+ grub_nilfs2_load_sb (data);
if (grub_errno)
goto fail;
- /* Make sure this is an nilfs2 filesystem. */
- if (!grub_nilfs2_valid_sb (&data->sblock))
- {
- grub_error (GRUB_ERR_BAD_FS, "not a nilfs2 filesystem");
- goto fail;
- }
-
nilfs2_block_count = (1 << LOG2_NILFS2_BLOCK_SIZE (data));
/* Read the last segment summary. */
if (grub_errno)
goto fail;
- data->disk = disk;
-
grub_nilfs2_read_last_checkpoint (data, &last_checkpoint);
if (grub_errno)