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/ext4/inode.c b/fs/ext4/inode.c
index 31db875..d9e633c 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3472,7 +3472,7 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
if (ret == 0) {
iomap->type = IOMAP_HOLE;
- iomap->blkno = IOMAP_NULL_BLOCK;
+ iomap->addr = IOMAP_NULL_ADDR;
iomap->length = (u64)map.m_len << blkbits;
} else {
if (map.m_flags & EXT4_MAP_MAPPED) {
@@ -3483,7 +3483,7 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
WARN_ON_ONCE(1);
return -EIO;
}
- iomap->blkno = (sector_t)map.m_pblk << (blkbits - 9);
+ iomap->addr = (u64)map.m_pblk << blkbits;
iomap->length = (u64)map.m_len << blkbits;
}
