iomap: Switch from blkno to disk offset
Replace iomap->blkno, the sector number, with iomap->addr, the disk
offset in bytes. For invalid disk offsets, use the special value
IOMAP_NULL_ADDR instead of IOMAP_NULL_BLOCK.
This allows to use iomap for mappings which are not block aligned, such
as inline data on ext4.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> # iomap, xfs
Reviewed-by: Jan Kara <jack@suse.cz>
diff --git a/fs/iomap.c b/fs/iomap.c
index be61cf7..d25db03 100644
--- a/fs/iomap.c
+++ b/fs/iomap.c
@@ -350,8 +350,8 @@ static int iomap_zero(struct inode *inode, loff_t pos, unsigned offset,
static int iomap_dax_zero(loff_t pos, unsigned offset, unsigned bytes,
struct iomap *iomap)
{
- sector_t sector = iomap->blkno +
- (((pos & ~(PAGE_SIZE - 1)) - iomap->offset) >> 9);
+ sector_t sector = (iomap->addr +
+ (pos & PAGE_MASK) - iomap->offset) >> 9;
return __dax_zero_page_range(iomap->bdev, iomap->dax_dev, sector,
offset, bytes);
@@ -512,9 +512,8 @@ static int iomap_to_fiemap(struct fiemap_extent_info *fi,
flags |= FIEMAP_EXTENT_SHARED;
return fiemap_fill_next_extent(fi, iomap->offset,
- iomap->blkno != IOMAP_NULL_BLOCK ? iomap->blkno << 9: 0,
+ iomap->addr != IOMAP_NULL_ADDR ? iomap->addr : 0,
iomap->length, flags);
-
}
static loff_t
@@ -823,7 +822,7 @@ iomap_dio_zero(struct iomap_dio *dio, struct iomap *iomap, loff_t pos,
bio = bio_alloc(GFP_KERNEL, 1);
bio_set_dev(bio, iomap->bdev);
bio->bi_iter.bi_sector =
- iomap->blkno + ((pos - iomap->offset) >> 9);
+ (iomap->addr + pos - iomap->offset) >> 9;
bio->bi_private = dio;
bio->bi_end_io = iomap_dio_bio_end_io;
@@ -902,7 +901,7 @@ iomap_dio_actor(struct inode *inode, loff_t pos, loff_t length,
bio = bio_alloc(GFP_KERNEL, nr_pages);
bio_set_dev(bio, iomap->bdev);
bio->bi_iter.bi_sector =
- iomap->blkno + ((pos - iomap->offset) >> 9);
+ (iomap->addr + pos - iomap->offset) >> 9;
bio->bi_write_hint = dio->iocb->ki_hint;
bio->bi_private = dio;
bio->bi_end_io = iomap_dio_bio_end_io;
