On Wed, Feb 05, 2020 at 10:36:09AM -0800, Christoph Hellwig wrote:
> > +int dax_iomap_zero(loff_t pos, unsigned offset, unsigned size,
> > + struct iomap *iomap)
> > {
> > pgoff_t pgoff;
> > long rc, id;
> > + sector_t sector = iomap_sector(iomap, pos & PAGE_MASK);
> >
> > - rc = bdev_dax_pgoff(bdev, sector, PAGE_SIZE, &pgoff);
> > + rc = bdev_dax_pgoff(iomap->bdev, sector, PAGE_SIZE, &pgoff);
> > if (rc)
> > return rc;
> >
> > id = dax_read_lock();
> > - rc = dax_zero_page_range(dax_dev, pgoff, offset, size);
> > + rc = dax_zero_page_range(iomap->dax_dev, pgoff, offset, size);
> > dax_read_unlock(id);
> > return rc;
> > }
> > -EXPORT_SYMBOL_GPL(__dax_zero_page_range);
> > +EXPORT_SYMBOL_GPL(dax_iomap_zero);
>
> This function is only used by fs/iomap/buffered-io.c, so no need to
> export it.
Will do.
>
> > #ifdef CONFIG_FS_DAX
> > -int __dax_zero_page_range(struct block_device *bdev,
> > - struct dax_device *dax_dev, sector_t sector,
> > - unsigned int offset, unsigned int length);
> > +int dax_iomap_zero(loff_t pos, unsigned offset, unsigned size,
> > + struct iomap *iomap);
> > #else
> > -static inline int __dax_zero_page_range(struct block_device *bdev,
> > - struct dax_device *dax_dev, sector_t sector,
> > - unsigned int offset, unsigned int length)
> > +static inline int dax_iomap_zero(loff_t pos, unsigned offset, unsigned size,
> > + struct iomap *iomap)
> > {
> > return -ENXIO;
> > }
>
> Given that the only caller is under an IS_DAX() check you could just
> declare the function unconditionally and let the compiler optimize
> away the guaranteed dead call for the !CONFIG_FS_DAX case, like we
> do with various other functions.
Sure, will do.
Vivek
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