On Mon, Jan 12, 2015 at 03:09:47PM -0800, Andrew Morton wrote:
> > +int dax_clear_blocks(struct inode *inode, sector_t block, long size)
> > +{
...
> > + if (pgsz < PAGE_SIZE)
> > + memset(addr, 0, pgsz);
> > + else
> > + clear_page(addr);
>
> Are there any cache issues in all this code? flush_dcache_page(addr)?
Here, no. This is only called to initialise a newly allocated block.
Elsewhere, maybe. When i was originally working on this, I think I had
code that forced mmaps of DAX files to be aligned to SHMLBA, because I
remember noticing a bug in sparc64's remap_file_range(). Unfortunately,
in the various rewrites, that got lost. So it needs to be put back in.
flush_dcache_page() in particular won't work because it needs a struct
page.
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