• Shaohua Li's avatar
    nullb: badbblocks support · 2f54a613
    Shaohua Li authored
    Sometime disk could have tracks broken and data there is inaccessable,
    but data in other parts can be accessed in normal way. MD RAID supports
    such disks. But we don't have a good way to test it, because we can't
    control which part of a physical disk is bad. For a virtual disk, this
    can be easily controlled.
    
    This patch adds a new 'badblock' attribute. Configure it in this way:
    echo "+1-100" > xxx/badblock, this will make sector [1-100] as bad
    blocks.
    echo "-20-30" > xxx/badblock, this will make sector [20-30] good
    
    If badblocks are accessed, the nullb disk will return IO error. Other
    parts of the disk can accessed in normal way.
    Signed-off-by: default avatarShaohua Li <shli@fb.com>
    Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
    2f54a613
null_blk.c 48 KB