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Thread: why online shrink is not supported with EXT4_IOC_RESIZE_FS?

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  1. #1
    Join Date
    Aug 2012
    Posts
    4

    Default why online shrink is not supported with EXT4_IOC_RESIZE_FS?

    Hi,

    I was referring EXT4_IOC_RESIZE_FS ioctl implementation in linux kernel ver 3.3.8.

    It is given in the code that online shrinking not supported.

    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.

    Regards,
    Raphel

  2. #2
    Join Date
    Aug 2012
    Posts
    4

    Default reason for not supporting online shrink in ext4

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

    Thanks,
    Raphel

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