[LU-2802] lmv_get_target should get index by checking ltd_idx

• Type: Bug
• Resolution: Fixed
• Priority: Blocker
• Fix Version/s: Lustre 2.4.0
• Affects Version/s: Lustre 2.4.0
• Labels: LB
• Severity: 3
• Assignee: Di Wang
• Reporter: Di Wang

Description

lmv_get_target should find target by checking ltd_idx, instead of return lmv->tgts[mds] directly.
In lmv_find_target, it will return lmv->tgts[mds] according to mdt_index, which is not correct. LMV index is created by mount sequence, while mdt_index by indicated by --index.

static inline struct lmv_tgt_desc *
lmv_get_target(struct lmv_obd *lmv, mdsno_t mds)
{       
        return &lmv->tgts[mds];
}       

static inline struct lmv_tgt_desc *
lmv_find_target(struct lmv_obd *lmv, const struct lu_fid *fid)
{               
        mdsno_t mds = 0;
        int rc;         
                        
        if (lmv->desc.ld_tgt_count > 1) {
                rc = lmv_fld_lookup(lmv, fid, &mds);
                if (rc) 
                        return ERR_PTR(rc);
        }                            
                        
        return lmv_get_target(lmv, mds);
}