• Arne Jansen's avatar
    btrfs: scrub · a2de733c
    Arne Jansen authored
    This adds an initial implementation for scrub. It works quite
    straightforward. The usermode issues an ioctl for each device in the
    fs. For each device, it enumerates the allocated device chunks. For
    each chunk, the contained extents are enumerated and the data checksums
    fetched. The extents are read sequentially and the checksums verified.
    If an error occurs (checksum or EIO), a good copy is searched for. If
    one is found, the bad copy will be rewritten.
    All enumerations happen from the commit roots. During a transaction
    commit, the scrubs get paused and afterwards continue from the new
    roots.
    
    This commit is based on the series originally posted to linux-btrfs
    with some improvements that resulted from comments from David Sterba,
    Ilya Dryomov and Jan Schmidt.
    Signed-off-by: default avatarArne Jansen <sensille@gmx.net>
    a2de733c
ioctl.h 7.25 KB