/*
* Look-up a slave index file. If the slave index isn't found:
* - if local is set to false, we allocate a FID from FID_SEQ_QUOTA sequence and
* create the index.
* - otherwise, we create the index file with a local reserved FID (see
* lquota_local_oid)
*
* \param env - is the environment passed by the caller
* \param dev - is the backend dt_device where to look-up/create the slave index
* \param parent - is the parent directory where to create the slave index if
* it does not exist already
* \param glb_fid - is the fid of the global index file associated with this
* slave index.
* \param uuid - is the uuid of slave which is (re)connecting to the master
* target
* \param local - indicate whether to use local reserved FID (LQUOTA_USR_OID
* & LQUOTA_GRP_OID) for the slave index creation or to
* allocate a new fid from sequence FID_SEQ_QUOTA
*
* \retval - pointer to the dt_object of the slave index on success,
* appropriate error on failure
*/
struct dt_object *lquota_disk_slv_find_create(const struct lu_env *env,
struct dt_device *dev,
struct dt_object *parent,
struct lu_fid *glb_fid,
struct obd_uuid *uuid,
bool local)
{
struct lquota_thread_info *qti = lquota_info(env);
struct dt_object *slv_idx;
int rc;
ENTRY;
LASSERT(uuid != NULL);
CDEBUG(D_QUOTA, "lookup/create slave index file for %s\n",
obd_uuid2str(uuid));
/* generate filename associated with the slave */
rc = lquota_disk_slv_filename(glb_fid, uuid, qti->qti_buf);
if (rc)
RETURN(ERR_PTR(rc));
/* Slave indexes uses the FID_SEQ_QUOTA sequence since they can be read
* through the network */
qti->qti_fid.f_seq = FID_SEQ_QUOTA;
qti->qti_fid.f_ver = 0;
if (local) {
int type;
rc = lquota_extract_fid(glb_fid, NULL, NULL, &type);
if (rc)
RETURN(ERR_PTR(rc));
/* use predefined fid in the reserved oid list */
qti->qti_fid.f_oid = (type == USRQUOTA) ? LQUOTA_USR_OID
: LQUOTA_GRP_OID;
slv_idx = local_index_find_or_create_with_fid(env, dev,
&qti->qti_fid,
parent,
qti->qti_buf,
LQUOTA_MODE,
&dt_quota_slv_features);
} else {
/* allocate fid dynamically if index does not exist already */
qti->qti_fid.f_oid = LQUOTA_GENERATED_OID;
/* lookup/create slave index file */
slv_idx = lquota_disk_find_create(env, dev, parent,
&qti->qti_fid,
&dt_quota_slv_features,
qti->qti_buf);
}
if (IS_ERR(slv_idx))
RETURN(slv_idx);
/* install index operation vector */
if (slv_idx->do_index_ops == NULL) {
rc = slv_idx->do_ops->do_index_try(env, slv_idx,
&dt_quota_slv_features);
if (rc) {
CERROR("%s: failed to setup index operations for "DFID
" rc:%d\n", dev->dd_lu_dev.ld_obd->obd_name,
PFID(lu_object_fid(&slv_idx->do_lu)), rc);
lu_object_put(env, &slv_idx->do_lu);
slv_idx = ERR_PTR(rc);
}
}
RETURN(slv_idx);
}
/*
* Handle quota request from slave.
*
* \param env - is the environment passed by the caller
* \param ld - is the lu device associated with the qmt
* \param req - is the quota acquire request
*/
static int qmt_dqacq(const struct lu_env *env, struct lu_device *ld,
struct ptlrpc_request *req)
{
struct qmt_device *qmt = lu2qmt_dev(ld);
struct quota_body *qbody, *repbody;
struct obd_uuid *uuid;
struct ldlm_lock *lock;
struct lquota_entry *lqe;
int pool_id, pool_type, qtype;
int rc;
ENTRY;
qbody = req_capsule_client_get(&req->rq_pill, &RMF_QUOTA_BODY);
if (qbody == NULL)
RETURN(err_serious(-EPROTO));
repbody = req_capsule_server_get(&req->rq_pill, &RMF_QUOTA_BODY);
if (repbody == NULL)
RETURN(err_serious(-EFAULT));
/* verify if global lock is stale */
if (!lustre_handle_is_used(&qbody->qb_glb_lockh))
RETURN(-ENOLCK);
lock = ldlm_handle2lock(&qbody->qb_glb_lockh);
if (lock == NULL)
RETURN(-ENOLCK);
LDLM_LOCK_PUT(lock);
uuid = &req->rq_export->exp_client_uuid;
if (req_is_rel(qbody->qb_flags) + req_is_acq(qbody->qb_flags) +
req_is_preacq(qbody->qb_flags) > 1) {
CERROR("%s: malformed quota request with conflicting flags set "
"(%x) from slave %s\n", qmt->qmt_svname,
qbody->qb_flags, obd_uuid2str(uuid));
RETURN(-EPROTO);
}
if (req_is_acq(qbody->qb_flags) || req_is_preacq(qbody->qb_flags)) {
/* acquire and pre-acquire should use a valid ID lock */
if (!lustre_handle_is_used(&qbody->qb_lockh))
RETURN(-ENOLCK);
lock = ldlm_handle2lock(&qbody->qb_lockh);
if (lock == NULL)
/* no lock associated with this handle */
RETURN(-ENOLCK);
LDLM_DEBUG(lock, "%sacquire request",
req_is_preacq(qbody->qb_flags) ? "pre" : "");
if (!obd_uuid_equals(&lock->l_export->exp_client_uuid, uuid)) {
/* sorry, no way to cheat ... */
LDLM_LOCK_PUT(lock);
RETURN(-ENOLCK);
}
if ((lock->l_flags & LDLM_FL_AST_SENT) != 0) {
struct ptlrpc_service_part *svc;
unsigned int timeout;
svc = req->rq_rqbd->rqbd_svcpt;
timeout = at_est2timeout(at_get(&svc->scp_at_estimate));
timeout = max(timeout, ldlm_timeout);
/* lock is being cancelled, prolong timeout */
ldlm_refresh_waiting_lock(lock, timeout);
}
LDLM_LOCK_PUT(lock);
}
/* extract pool & quota information from global index FID packed in the
* request */
rc = lquota_extract_fid(&qbody->qb_fid, &pool_id, &pool_type, &qtype);
if (rc)
RETURN(-EINVAL);
/* Find the quota entry associated with the quota id */
lqe = qmt_pool_lqe_lookup(env, qmt, pool_id, pool_type, qtype,
&qbody->qb_id);
if (IS_ERR(lqe))
RETURN(PTR_ERR(lqe));
/* process quota request */
rc = qmt_dqacq0(env, lqe, qmt, uuid, qbody->qb_flags, qbody->qb_count,
qbody->qb_usage, repbody);
if (lustre_handle_is_used(&qbody->qb_lockh))
/* return current qunit value only to slaves owning an per-ID
* quota lock. For enqueue, the qunit value will be returned in
* the LVB */
repbody->qb_qunit = lqe->lqe_qunit;
lqe_putref(lqe);
RETURN(rc);
}
