• Yongqiang Yang's avatar
    ext4: add new online resize interface · 19c5246d
    Yongqiang Yang authored
    This patch adds new online resize interface, whose input argument is a
    64-bit integer indicating how many blocks there are in the resized fs.
    
    In new resize impelmentation, all work like allocating group tables
    are done by kernel side, so the new resize interface can support
    flex_bg feature and prepares ground for suppoting resize with features
    like bigalloc and exclude bitmap. Besides these, user-space tools just
    passes in the new number of blocks.
    
    We delay initializing the bitmaps and inode tables of added groups if
    possible and add multi groups (a flex groups) each time, so new resize
    is very fast like mkfs.
    Signed-off-by: default avatarYongqiang Yang <xiaoqiangnk@gmail.com>
    Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
    19c5246d
ext4.txt 25.8 KB