[LU-14423] osd_is_mapped() does not recognize holes

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.15.0
• Severity: 3
• Assignee: Alex Zhuravlev
• Reporter: Alex Zhuravlev

Description

ldiskfs_fiemap() can return a hole in form

{0,0,0}

and then the following construction recognizes this as an allocated space:

        if (start > block) {
                cached_extent->start = block;
                cached_extent->end = start;
                cached_extent->mapped = 0;
        } else {
                cached_extent->start = start;
                cached_extent->end = (fe.fe_logical + fe.fe_length) >>
                                      inode->i_blkbits;
                cached_extent->mapped = 1;
        }