Ah, sorry, I should be comparing against the superblock, not the group_desc.
uint16_t s_ninodes; uint16_t s_nzones; uint32_t s_inodes_count; uint16_t s_imap_blocks; uint16_t s_zmap_blocks; uint32_t s_blocks_count; uint16_t s_firstdatazone; uint16_t s_log_zone_size; uint32_t s_r_blocks_count; uint32_t s_max_size; uint32_t s_free_blocks_count; uint16_t s_magic; uint32_t s_free_inodes_count; for "sb->s_imap_blocks == 0 || sb->s_zmap_blocks == 0" to fail, the low 32bits of the ext4 max block count must be >65536 and not a multiple of 65536, so adjust the "dd" in comment 3 to: dd if=/dev/zero of=test.ext4 bs=1 count=1 seek=1026M this will result in non-zero values for both s_imap_blocks and s_zmap_blocks: $ hexdump -s 0x404 -n 4 -e '2/2 "%d " "\n"' /tmp/test.ext4 512 4 -- mount ext fileystem fails, booting fails, blkid produces no output https://bugs.launchpad.net/bugs/518582 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
