| Message ID | 20211018044054.1779424-9-hch@lst.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [01/11] dm: make the DAX support dependend on CONFIG_FS_DAX | expand |
On Sun, Oct 17, 2021 at 9:41 PM Christoph Hellwig <hch@lst.de> wrote: > > Add a helper to perform the entire remapping for DAX accesses. This > helper open codes bdev_dax_pgoff given that the alignment checks have > already been done by the submitting file system and don't need to be > repeated. Looks good. Mike, ack? > > Signed-off-by: Christoph Hellwig <hch@lst.de> > --- > drivers/md/dm-linear.c | 49 +++++++++++++----------------------------- > 1 file changed, 15 insertions(+), 34 deletions(-) > > diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c > index 32fbab11bf90c..bf03f73fd0f36 100644 > --- a/drivers/md/dm-linear.c > +++ b/drivers/md/dm-linear.c > @@ -164,63 +164,44 @@ static int linear_iterate_devices(struct dm_target *ti, > } > > #if IS_ENABLED(CONFIG_FS_DAX) > +static struct dax_device *linear_dax_pgoff(struct dm_target *ti, pgoff_t *pgoff) > +{ > + struct linear_c *lc = ti->private; > + sector_t sector = linear_map_sector(ti, *pgoff << PAGE_SECTORS_SHIFT); > + > + *pgoff = (get_start_sect(lc->dev->bdev) + sector) >> PAGE_SECTORS_SHIFT; > + return lc->dev->dax_dev; > +} > + > static long linear_dax_direct_access(struct dm_target *ti, pgoff_t pgoff, > long nr_pages, void **kaddr, pfn_t *pfn) > { > - long ret; > - struct linear_c *lc = ti->private; > - struct block_device *bdev = lc->dev->bdev; > - struct dax_device *dax_dev = lc->dev->dax_dev; > - sector_t dev_sector, sector = pgoff * PAGE_SECTORS; > - > - dev_sector = linear_map_sector(ti, sector); > - ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages * PAGE_SIZE, &pgoff); > - if (ret) > - return ret; > + struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff); > + > return dax_direct_access(dax_dev, pgoff, nr_pages, kaddr, pfn); > } > > static size_t linear_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff, > void *addr, size_t bytes, struct iov_iter *i) > { > - struct linear_c *lc = ti->private; > - struct block_device *bdev = lc->dev->bdev; > - struct dax_device *dax_dev = lc->dev->dax_dev; > - sector_t dev_sector, sector = pgoff * PAGE_SECTORS; > + struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff); > > - dev_sector = linear_map_sector(ti, sector); > - if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff)) > - return 0; > return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i); > } > > static size_t linear_dax_copy_to_iter(struct dm_target *ti, pgoff_t pgoff, > void *addr, size_t bytes, struct iov_iter *i) > { > - struct linear_c *lc = ti->private; > - struct block_device *bdev = lc->dev->bdev; > - struct dax_device *dax_dev = lc->dev->dax_dev; > - sector_t dev_sector, sector = pgoff * PAGE_SECTORS; > + struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff); > > - dev_sector = linear_map_sector(ti, sector); > - if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff)) > - return 0; > return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i); > } > > static int linear_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff, > size_t nr_pages) > { > - int ret; > - struct linear_c *lc = ti->private; > - struct block_device *bdev = lc->dev->bdev; > - struct dax_device *dax_dev = lc->dev->dax_dev; > - sector_t dev_sector, sector = pgoff * PAGE_SECTORS; > - > - dev_sector = linear_map_sector(ti, sector); > - ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages << PAGE_SHIFT, &pgoff); > - if (ret) > - return ret; > + struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff); > + > return dax_zero_page_range(dax_dev, pgoff, nr_pages); > } > > -- > 2.30.2 >
On Wed, Oct 27 2021 at 9:32P -0400, Dan Williams <dan.j.williams@intel.com> wrote: > On Sun, Oct 17, 2021 at 9:41 PM Christoph Hellwig <hch@lst.de> wrote: > > > > Add a helper to perform the entire remapping for DAX accesses. This > > helper open codes bdev_dax_pgoff given that the alignment checks have > > already been done by the submitting file system and don't need to be > > repeated. > > Looks good. > > Mike, ack? Acked-by: Mike Snitzer <snitzer@redhat.com>
diff --git a/drivers/md/dm-linear.c b/drivers/md/dm-linear.c index 32fbab11bf90c..bf03f73fd0f36 100644 --- a/drivers/md/dm-linear.c +++ b/drivers/md/dm-linear.c @@ -164,63 +164,44 @@ static int linear_iterate_devices(struct dm_target *ti, } #if IS_ENABLED(CONFIG_FS_DAX) +static struct dax_device *linear_dax_pgoff(struct dm_target *ti, pgoff_t *pgoff) +{ + struct linear_c *lc = ti->private; + sector_t sector = linear_map_sector(ti, *pgoff << PAGE_SECTORS_SHIFT); + + *pgoff = (get_start_sect(lc->dev->bdev) + sector) >> PAGE_SECTORS_SHIFT; + return lc->dev->dax_dev; +} + static long linear_dax_direct_access(struct dm_target *ti, pgoff_t pgoff, long nr_pages, void **kaddr, pfn_t *pfn) { - long ret; - struct linear_c *lc = ti->private; - struct block_device *bdev = lc->dev->bdev; - struct dax_device *dax_dev = lc->dev->dax_dev; - sector_t dev_sector, sector = pgoff * PAGE_SECTORS; - - dev_sector = linear_map_sector(ti, sector); - ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages * PAGE_SIZE, &pgoff); - if (ret) - return ret; + struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff); + return dax_direct_access(dax_dev, pgoff, nr_pages, kaddr, pfn); } static size_t linear_dax_copy_from_iter(struct dm_target *ti, pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i) { - struct linear_c *lc = ti->private; - struct block_device *bdev = lc->dev->bdev; - struct dax_device *dax_dev = lc->dev->dax_dev; - sector_t dev_sector, sector = pgoff * PAGE_SECTORS; + struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff); - dev_sector = linear_map_sector(ti, sector); - if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff)) - return 0; return dax_copy_from_iter(dax_dev, pgoff, addr, bytes, i); } static size_t linear_dax_copy_to_iter(struct dm_target *ti, pgoff_t pgoff, void *addr, size_t bytes, struct iov_iter *i) { - struct linear_c *lc = ti->private; - struct block_device *bdev = lc->dev->bdev; - struct dax_device *dax_dev = lc->dev->dax_dev; - sector_t dev_sector, sector = pgoff * PAGE_SECTORS; + struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff); - dev_sector = linear_map_sector(ti, sector); - if (bdev_dax_pgoff(bdev, dev_sector, ALIGN(bytes, PAGE_SIZE), &pgoff)) - return 0; return dax_copy_to_iter(dax_dev, pgoff, addr, bytes, i); } static int linear_dax_zero_page_range(struct dm_target *ti, pgoff_t pgoff, size_t nr_pages) { - int ret; - struct linear_c *lc = ti->private; - struct block_device *bdev = lc->dev->bdev; - struct dax_device *dax_dev = lc->dev->dax_dev; - sector_t dev_sector, sector = pgoff * PAGE_SECTORS; - - dev_sector = linear_map_sector(ti, sector); - ret = bdev_dax_pgoff(bdev, dev_sector, nr_pages << PAGE_SHIFT, &pgoff); - if (ret) - return ret; + struct dax_device *dax_dev = linear_dax_pgoff(ti, &pgoff); + return dax_zero_page_range(dax_dev, pgoff, nr_pages); }
Add a helper to perform the entire remapping for DAX accesses. This helper open codes bdev_dax_pgoff given that the alignment checks have already been done by the submitting file system and don't need to be repeated. Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/md/dm-linear.c | 49 +++++++++++++----------------------------- 1 file changed, 15 insertions(+), 34 deletions(-)