• L
    ext4: only load buddy bitmap in ext4_trim_fs() when it is needed · 78944086
    Lukas Czerner 提交于
    Currently we are loading buddy ext4_mb_load_buddy() for every block
    group we are going through in ext4_trim_fs() in many cases just to find
    out that there is not enough space to be bothered with. As Amir Goldstein
    suggested we can use bb_free information directly from ext4_group_info.
    
    This commit removes ext4_mb_load_buddy() from ext4_trim_fs() and rather
    get the ext4_group_info via ext4_get_group_info() and use the bb_free
    information directly from that. This avoids unnecessary call to load
    buddy in the case the group does not have enough free space to trim.
    Loading buddy is now moved to ext4_trim_all_free().
    
    Tested by me with xfstests 251.
    Signed-off-by: NLukas Czerner <lczerner@redhat.com>
    Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
    78944086
mballoc.c 134.2 KB