• Michael Callahan's avatar
    block: Add and use op_stat_group() for indexing disk_stat fields. · ddcf35d3
    Michael Callahan authored
    Add and use a new op_stat_group() function for indexing partition stat
    fields rather than indexing them by rq_data_dir() or bio_data_dir().
    This function works similarly to op_is_sync() in that it takes the
    request::cmd_flags or bio::bi_opf flags and determines which stats
    should et updated.
    
    In addition, the second parameter to generic_start_io_acct() and
    generic_end_io_acct() is now a REQ_OP rather than simply a read or
    write bit and it uses op_stat_group() on the parameter to determine
    the stat group.
    
    Note that the partition in_flight counts are not part of the per-cpu
    statistics and as such are not indexed via this function.  It's now
    indexed by op_is_write().
    
    tj: Refreshed on top of v4.17.  Updated to pass around REQ_OP.
    Signed-off-by: default avatarMichael Callahan <michaelcallahan@fb.com>
    Signed-off-by: default avatarTejun Heo <tj@kernel.org>
    Cc: Minchan Kim <minchan@kernel.org>
    Cc: Dan Williams <dan.j.williams@intel.com>
    Cc: Joshua Morris <josh.h.morris@us.ibm.com>
    Cc: Philipp Reisner <philipp.reisner@linbit.com>
    Cc: Matias Bjorling <mb@lightnvm.io>
    Cc: Kent Overstreet <kent.overstreet@gmail.com>
    Cc: Alasdair Kergon <agk@redhat.com>
    Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
    ddcf35d3
dm.c 73.2 KB