On Tue 07-08-18 15:11:43, Dave Jiang wrote: > This patch is the duplicate of ross's fix for ext4 for xfs. > > If the refcount of a page is lowered between the time that it is returned > by dax_busy_page() and when the refcount is again checked in > xfs_break_layouts() => ___wait_var_event(), the waiting function > xfs_wait_dax_page() will never be called. This means that > xfs_break_layouts() will still have 'retry' set to false, so we'll stop > looping and never check the refcount of other pages in this inode. > > Instead, always continue looping as long as dax_layout_busy_page() gives us > a page which it found with an elevated refcount. > > Signed-off-by: Dave Jiang <dave.jiang@xxxxxxxxx> The patch looks good to me. You can add: Reviewed-by: Jan Kara <jack@xxxxxxx> Just one minor nit below: > @@ -746,9 +744,10 @@ xfs_break_dax_layouts( > if (!page) > return 0; > > + *did_unlock = true; I think it would be more understandable to name the argument of xfs_break_dax_layouts() as 'retry' instead of 'did_unlock' as it's not about unlocking anymore. Honza -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR
