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iomap: Switch from blkno to disk offset

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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>
This commit is contained in:
Andreas Gruenbacher 2017-10-01 17:55:54 -04:00 • committed by Theodore Ts'o
parent 9e66317d3c
commit 19fe5f643f
8 changed files with 22 additions and 23 deletions
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4
fs/buffer.c
View file

@ -1978,8 +1978,8 @@ iomap_to_bh(struct inode *inode, sector_t block, struct buffer_head *bh,
case IOMAP_MAPPED:
if (offset >= i_size_read(inode))
set_buffer_new(bh);
bh->b_blocknr = (iomap->blkno >> (inode->i_blkbits - 9)) +
((offset - iomap->offset) >> inode->i_blkbits);
bh->b_blocknr = (iomap->addr + offset - iomap->offset) >>
inode->i_blkbits;
set_buffer_mapped(bh);
break;
}