[LU-2681] need to handle lsr_flags having other flags set

• Type: Technical task
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.4.0
• Affects Version/s: Lustre 2.4.0
• Labels: MB
• Assignee: Di Wang
• Reporter: Andreas Dilger

Description

The "lsr_flags" field is currently treated as if it only held LU_SEQ_RANGE_MDT or LU_SEQ_RANGE_OST values. These cannot purely be treated as flags, since LU_SEQ_RANGE_MDT = 0 for compatibility reasons.

If the lsr_flags field ever gets other flags in the future, then checks using "==" instead of "&" will fail, for example:

lustre/osd-zfs/osd_oi.c:266

       if (range->lsr_flags == LU_SEQ_RANGE_OST)

A similar "==" check is made in fld_server_lookup().

Probably an LU_SEQ_RANGE_TYPE = 1 mask should be created, and then helper function can be created to check the type:

unsigned fld_range_type(struct lu_seq_range *range)
{
         return range->lsr_flags & LU_SEQ_RANGE_TYPE;
}

and it can be used like:

        if (fld_range_type(range) == LU_SEQ_RANGE_OST)
or
        if (fld_range_type(range) == LU_SEQ_RANGE_MDT)
or
        if (fld_range_type(erange) == fld_range_type(range))