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  1. #1

    why online shrink is not supported in EXT4_IOC_RESIZE_FS ioctl?


    I referred EXT4_IOC_RESIZE_FS ioctl implementation in linux kernel ver 3.3.8.

    Online shrinking is not supported and the code is as below.

    if (n_blocks_count < o_blocks_count) {
    /* On-line shrinking not supported */
    ext4_warning(sb, "can't shrink FS - resize aborted");
    return -EINVAL;

    Can anyone please tell the reason why online shrinking is not supported.

    Thanks in adavance.


  2. #2
    Shrinking volume offline is possible in ext4.

    Can anyone please tell me what are the issues in implementing shrinking volume online in ext4.


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