• Miao Xie's avatar
    Btrfs: do file data check by sub-bio's self · c1dc0896
    Miao Xie authored
    Direct IO splits the original bio to several sub-bios because of the limit of
    raid stripe, and the filesystem will wait for all sub-bios and then run final
    end io process.
    
    But it was very hard to implement the data repair when dio read failure happens,
    because at the final end io function, we didn't know which mirror the data was
    read from. So in order to implement the data repair, we have to move the file data
    check in the final end io function to the sub-bio end io function, in which we can
    get the mirror number of the device we access. This patch did this work as the
    first step of the direct io data repair implementation.
    Signed-off-by: default avatarMiao Xie <miaox@cn.fujitsu.com>
    Signed-off-by: default avatarChris Mason <clm@fb.com>
    c1dc0896
volumes.h 14.6 KB