On 2017/10/19 16:45, Satoru Takeuchi wrote: > Some tools can select which superblock these commands use by "-s <superblock>" > option. Although this option says the valid values are 0-2, we can set 3 > if filesystem is very large. > Hello, Wiki says there are 4 superblocks. However in the implementation BTRFS_SUPER_MIROR_MAX is 3 and 0 indicates the block at 64K (disk-io.h of btrfs-progs), therefore I think there is no 4th superblock actually. Regards, Tomohiro -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
