Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> writes: > On Mon, 24 Oct 2022 12:05:54 -0700 Stefan Roesch <shr@xxxxxxxxxxxx> wrote: > >> This adds a function to return the specified value for max_bytes. It >> converts the stored max_ratio of the bdi to the corresponding bytes >> value. It introduces the bdi_get_bytes helper function to do the >> conversion. This is an approximation as it is based on the value that is >> returned by global_dirty_limits(), which can change. The helper function >> will also be used by the min_bytes bdi knob. >> >> --- a/include/linux/backing-dev.h >> +++ b/include/linux/backing-dev.h >> @@ -105,6 +105,7 @@ static inline unsigned long wb_stat_error(void) >> /* BDI ratio is expressed as part per 1000 for finer granularity. */ >> #define BDI_RATIO_SCALE 10 >> >> +unsigned long long bdi_get_max_bytes(struct backing_dev_info *bdi); > > We don't use unsigned long long much. If you want a 64-bit unsigned, > use u64? > The next version will use u64. >> +EXPORT_SYMBOL_GPL(bdi_get_max_bytes); > > Is this symbol to be used by modules? The next version will remove the export.
