• Joel Becker's avatar
    ocfs2: Wrap virtual block reads in ocfs2_read_virt_blocks() · a8549fb5
    Joel Becker authored
    The ocfs2_read_dir_block() function really maps an inode's virtual
    blocks to physical ones before calling ocfs2_read_blocks().  Let's
    extract that to common code, because other places might want to do that.
    Other than the block number being virtual, ocfs2_read_virt_blocks()
    takes the same arguments as ocfs2_read_blocks().  It converts those
    virtual block numbers to physical before calling ocfs2_read_blocks()
    directly.  If the blocks asked for are discontiguous, this can mean
    multiple calls to ocfs2_read_blocks(), but this is mostly hidden from
    the caller.
    Like ocfs2_read_blocks(), the caller can pass in an existing
    buffer_head.  This is usually done to pick up some readahead I/O.
    ocfs2_read_virt_blocks() checks the buffer_head's block number
    against the extent map - it must match.
    Signed-off-by: default avatarJoel Becker <joel.becker@oracle.com>
    Signed-off-by: default avatarMark Fasheh <mfasheh@suse.com>
extent_map.c 20.6 KB