[LU-5871] Do not return -EAGAIN in lod_object_init

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.7.0
• Affects Version/s: Lustre 2.7.0
• Severity: 3
• Assignee: Di Wang
• Reporter: Di Wang

Description

Do not return EWOULDBLOCK (EAGAIN) in lod_object_init, since lu_object_find_at is using EAGAIN to check whether the object is dying and waiting the object to be released.

struct lu_object *lu_object_find_at(const struct lu_env *env,
                                    struct lu_device *dev,
                                    const struct lu_fid *f,
                                    const struct lu_object_conf *conf)
{
        struct lu_site_bkt_data *bkt;
        struct lu_object        *obj;
        wait_queue_t           wait;

        while (1) {
                if (conf != NULL && conf->loc_flags & LOC_F_NOWAIT) {
                        obj = lu_object_find_try(env, dev, f, conf, NULL);

                        return obj;
                }

                obj = lu_object_find_try(env, dev, f, conf, &wait);
                if (obj != ERR_PTR(-EAGAIN))  <--- Only wait here if the object is dying, obviously the failure(-EWOULDBLOCK) of lod_object_init should not wait here, otherwise it will cause list corruption.
                        return obj;

Issue Links

• is related to: LU-11761 blocked MDT mount and high cpu usage from lodXXXX_recYYYY threads