[LU-14837] Layout corruption (lmm_oi) inside mdd_swap_layouts

Duplicate — Wed, 21 Jul 2021 11:33:46 +0000

The following code in mdd_swap_layouts is not valid for PFL layout:

         /* set the file specific informations in lmm */
         if (fst_lmm != NULL) {
                 saved_oi = &info->mti_oa.o_oi;
                 mdd_get_lmm_oi(fst_lmm, saved_oi);
                 mdd_set_lmm_gen(fst_lmm, &snd_gen);
           ----> mdd_set_lmm_oi(fst_lmm, &snd_lmm->lmm_oi);
                 mdd_set_lmm_oi(snd_lmm, saved_oi);
         } else {

For PFL layout, snd_lmm does not point directly to a lov_mds_md structure but on a lov_comp_md_v1 structure.

We have to access to the different component entries defined inside lov_comp_md_v1 and then apply offsets to access to the lov_mds_md structures.

LFSK can correct this inconsistencies. this will increment the "inconsistencies_other/repaired_other" counter.

WARNING:

Do not try to run LFSCK on a 2.12.4 for this. This will corrupted every migrated layouts because of the ~~LU-13535~~ "Files truncated/corruption due to lfsck"

Whamcloud Community JIRA

[LU-14837] Layout corruption (lmm_oi) inside mdd_swap_layouts