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    ext4: Clean up s_dirt handling · a0375156
    Theodore Ts'o 提交于
    We don't need to set s_dirt in most of the ext4 code when journaling
    is enabled.  In ext3/4 some of the summary statistics for # of free
    inodes, blocks, and directories are calculated from the per-block
    group statistics when the file system is mounted or unmounted.  As a
    result the superblock doesn't have to be updated, either via the
    journal or by setting s_dirt.  There are a few exceptions, most
    notably when resizing the file system, where the superblock needs to
    be modified --- and in that case it should be done as a journalled
    operation if possible, and s_dirt set only in no-journal mode.
    
    This patch will optimize out some unneeded disk writes when using ext4
    with a journal.
    Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
    a0375156
ext4_jbd2.c 4.0 KB