* GPL HEADER END
*/
/*
- * Copyright (c) 2012 Intel, Inc.
+ * Copyright (c) 2012, 2017, Intel Corporation.
* Use is subject to license terms.
*
* Author: Johann Lombardi <johann.lombardi@intel.com>
* Author: Niu Yawei <yawei.niu@intel.com>
*/
-#ifndef EXPORT_SYMTAB
-# define EXPORT_SYMTAB
-#endif
-
#define DEBUG_SUBSYSTEM S_LQUOTA
+#include <linux/kthread.h>
+
#include <lustre_dlm.h>
+#include <lustre_swab.h>
+#include <obd_class.h>
+
#include "qmt_internal.h"
/* intent policy function called from mdt_intent_opc() when the intent is of
struct ptlrpc_request *req, struct ldlm_lock **lockp,
int flags)
{
+ struct qmt_device *qmt = lu2qmt_dev(ld);
+ struct ldlm_intent *it;
+ struct quota_body *reqbody;
+ struct quota_body *repbody;
+ struct obd_uuid *uuid;
+ struct lquota_lvb *lvb;
+ struct ldlm_resource *res = (*lockp)->l_resource;
+ struct ldlm_reply *ldlm_rep;
+ int rc, lvb_len;
ENTRY;
req_capsule_extend(&req->rq_pill, &RQF_LDLM_INTENT_QUOTA);
- RETURN(ELDLM_LOCK_ABORTED);
+ req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
+ ldlm_lvbo_size(*lockp));
+
+ /* extract quota body and intent opc */
+ it = req_capsule_client_get(&req->rq_pill, &RMF_LDLM_INTENT);
+ if (it == NULL)
+ RETURN(err_serious(-EFAULT));
+
+ reqbody = req_capsule_client_get(&req->rq_pill, &RMF_QUOTA_BODY);
+ if (reqbody == NULL)
+ RETURN(err_serious(-EFAULT));
+
+ /* prepare reply */
+ rc = req_capsule_server_pack(&req->rq_pill);
+ if (rc != 0) {
+ CERROR("Can't pack response, rc %d\n", rc);
+ RETURN(err_serious(rc));
+ }
+
+ repbody = req_capsule_server_get(&req->rq_pill, &RMF_QUOTA_BODY);
+ if (repbody == NULL)
+ RETURN(err_serious(-EFAULT));
+
+ ldlm_rep = req_capsule_server_get(&req->rq_pill, &RMF_DLM_REP);
+ if (ldlm_rep == NULL)
+ RETURN(err_serious(-EFAULT));
+
+ uuid = &(*lockp)->l_export->exp_client_uuid;
+ switch (it->opc) {
+
+ case IT_QUOTA_DQACQ: {
+ struct lquota_entry *lqe;
+ struct ldlm_lock *lock;
+
+ if (res->lr_name.name[LUSTRE_RES_ID_QUOTA_SEQ_OFF] == 0)
+ /* acquire on global lock? something is wrong ... */
+ GOTO(out, rc = -EPROTO);
+
+ /* verify global lock isn't stale */
+ if (!lustre_handle_is_used(&reqbody->qb_glb_lockh))
+ GOTO(out, rc = -ENOLCK);
+
+ lock = ldlm_handle2lock(&reqbody->qb_glb_lockh);
+ if (lock == NULL)
+ GOTO(out, rc = -ENOLCK);
+ LDLM_LOCK_PUT(lock);
+
+ lqe = res->lr_lvb_data;
+ LASSERT(lqe != NULL);
+ lqe_getref(lqe);
+
+ /* acquire quota space */
+ rc = qmt_dqacq0(env, lqe, qmt, uuid, reqbody->qb_flags,
+ reqbody->qb_count, reqbody->qb_usage,
+ repbody);
+ lqe_putref(lqe);
+ if (rc)
+ GOTO(out, rc);
+ break;
+ }
+
+ case IT_QUOTA_CONN:
+ /* new connection from slave */
+
+ if (res->lr_name.name[LUSTRE_RES_ID_QUOTA_SEQ_OFF] != 0)
+ /* connection on per-ID lock? something is wrong ... */
+ GOTO(out, rc = -EPROTO);
+
+ rc = qmt_pool_new_conn(env, qmt, &reqbody->qb_fid,
+ &repbody->qb_slv_fid,
+ &repbody->qb_slv_ver, uuid);
+ if (rc)
+ GOTO(out, rc);
+ break;
+
+ default:
+ CERROR("%s: invalid intent opcode: %llu\n", qmt->qmt_svname,
+ it->opc);
+ GOTO(out, rc = -EINVAL);
+ }
+
+ /* on success, pack lvb in reply */
+ lvb = req_capsule_server_get(&req->rq_pill, &RMF_DLM_LVB);
+ lvb_len = ldlm_lvbo_size(*lockp);
+ lvb_len = ldlm_lvbo_fill(*lockp, lvb, &lvb_len);
+ if (lvb_len < 0)
+ GOTO(out, rc = lvb_len);
+
+ req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB, lvb_len, RCL_SERVER);
+out:
+ ldlm_rep->lock_policy_res2 = clear_serious(rc);
+ EXIT;
+ return ELDLM_OK;
}
/*
*/
int qmt_lvbo_init(struct lu_device *ld, struct ldlm_resource *res)
{
- return 0;
+ struct lu_env *env;
+ struct qmt_thread_info *qti;
+ struct qmt_device *qmt = lu2qmt_dev(ld);
+ int pool_type, qtype;
+ int rc;
+ ENTRY;
+
+ LASSERT(res != NULL);
+
+ if (res->lr_type != LDLM_PLAIN)
+ RETURN(-ENOTSUPP);
+
+ if (res->lr_lvb_data ||
+ res->lr_name.name[LUSTRE_RES_ID_SEQ_OFF] != FID_SEQ_QUOTA_GLB)
+ RETURN(0);
+
+ env = lu_env_find();
+ LASSERT(env);
+ qti = qmt_info(env);
+
+ /* extract global index FID and quota identifier */
+ fid_extract_from_quota_res(&qti->qti_fid, &qti->qti_id, &res->lr_name);
+
+ /* sanity check the global index FID */
+ rc = lquota_extract_fid(&qti->qti_fid, &pool_type, &qtype);
+ if (rc) {
+ CERROR("can't extract glb index information from FID "DFID"\n",
+ PFID(&qti->qti_fid));
+ GOTO(out, rc);
+ }
+
+ if (res->lr_name.name[LUSTRE_RES_ID_QUOTA_SEQ_OFF] != 0) {
+ /* no ID quota lock associated with UID/GID 0 or with a seq 0,
+ * we are thus dealing with an ID lock. */
+ struct lquota_entry *lqe;
+
+ /* Find the quota entry associated with the quota id */
+ lqe = qmt_pool_lqe_lookup(env, qmt, pool_type, qtype,
+ &qti->qti_id);
+ if (IS_ERR(lqe))
+ GOTO(out, rc = PTR_ERR(lqe));
+
+ /* store reference to lqe in lr_lvb_data */
+ res->lr_lvb_data = lqe;
+ LQUOTA_DEBUG(lqe, "initialized res lvb");
+ } else {
+ struct dt_object *obj;
+
+ /* lookup global index */
+ obj = dt_locate(env, qmt->qmt_child, &qti->qti_fid);
+ if (IS_ERR(obj))
+ GOTO(out, rc = PTR_ERR(obj));
+ if (!dt_object_exists(obj)) {
+ dt_object_put(env, obj);
+ GOTO(out, rc = -ENOENT);
+ }
+
+ /* store reference to global index object in lr_lvb_data */
+ res->lr_lvb_data = obj;
+ CDEBUG(D_QUOTA, DFID" initialized lvb\n", PFID(&qti->qti_fid));
+ }
+
+ res->lr_lvb_len = sizeof(struct lquota_lvb);
+ EXIT;
+out:
+ return rc;
}
/*
* Update LVB associated with the global quota index.
* This function is called from the DLM itself after a glimpse callback, in this
- * case valid ptlrpc request is passed. It is also called directly from the
- * quota master in order to refresh the global index version after a quota limit
- * change.
+ * case valid ptlrpc request is passed.
*/
int qmt_lvbo_update(struct lu_device *ld, struct ldlm_resource *res,
struct ptlrpc_request *req, int increase_only)
{
- return 0;
+ struct lu_env *env;
+ struct qmt_thread_info *qti;
+ struct qmt_device *qmt = lu2qmt_dev(ld);
+ struct lquota_entry *lqe;
+ struct lquota_lvb *lvb;
+ struct ldlm_lock *lock;
+ struct obd_export *exp;
+ int rc = 0;
+ ENTRY;
+
+ LASSERT(res != NULL);
+
+ if (req == NULL)
+ RETURN(0);
+
+ if (res->lr_name.name[LUSTRE_RES_ID_QUOTA_SEQ_OFF] == 0)
+ /* no need to update lvb for global quota locks */
+ RETURN(0);
+
+ lvb = req_capsule_server_swab_get(&req->rq_pill, &RMF_DLM_LVB,
+ lustre_swab_lquota_lvb);
+ if (lvb == NULL) {
+ CERROR("%s: failed to extract lvb from request\n",
+ qmt->qmt_svname);
+ RETURN(-EFAULT);
+ }
+
+ lqe = res->lr_lvb_data;
+ LASSERT(lqe != NULL);
+ lqe_getref(lqe);
+
+ LQUOTA_DEBUG(lqe, "releasing:%llu may release:%llu",
+ lvb->lvb_id_rel, lvb->lvb_id_may_rel);
+
+ if (lvb->lvb_id_rel == 0) {
+ /* nothing to release */
+ if (lvb->lvb_id_may_rel != 0)
+ /* but might still release later ... */
+ lqe->lqe_may_rel += lvb->lvb_id_may_rel;
+ GOTO(out, rc = 0);
+ }
+
+ /* allocate environement */
+ env = lu_env_find();
+ LASSERT(env);
+ qti = qmt_info(env);
+
+ /* The request is a glimpse callback which was sent via the
+ * reverse import to the slave. What we care about here is the
+ * export associated with the slave and req->rq_export is
+ * definitely not what we are looking for (it is actually set to
+ * NULL here).
+ * Therefore we extract the lock from the request argument
+ * and use lock->l_export. */
+ lock = ldlm_request_lock(req);
+ if (IS_ERR(lock)) {
+ CERROR("%s: failed to get lock from request!\n",
+ qmt->qmt_svname);
+ GOTO(out, rc = PTR_ERR(lock));
+ }
+
+ exp = class_export_get(lock->l_export);
+ if (exp == NULL) {
+ CERROR("%s: failed to get export from lock!\n",
+ qmt->qmt_svname);
+ GOTO(out, rc = -EFAULT);
+ }
+
+ /* release quota space */
+ rc = qmt_dqacq0(env, lqe, qmt, &exp->exp_client_uuid,
+ QUOTA_DQACQ_FL_REL, lvb->lvb_id_rel, 0, &qti->qti_body);
+ if (rc || qti->qti_body.qb_count != lvb->lvb_id_rel)
+ LQUOTA_ERROR(lqe, "failed to release quota space on glimpse "
+ "%llu!=%llu : rc = %d\n", qti->qti_body.qb_count,
+ lvb->lvb_id_rel, rc);
+ class_export_put(exp);
+ if (rc)
+ GOTO(out, rc);
+ EXIT;
+out:
+ lqe_putref(lqe);
+ return rc;
}
/*
* Report size of lvb to ldlm layer in order to allocate lvb buffer
+ * As far as quota locks are concerned, the size is static and is the same
+ * for both global and per-ID locks which shares the same lvb format.
*/
int qmt_lvbo_size(struct lu_device *ld, struct ldlm_lock *lock)
{
- return 0;
+ return sizeof(struct lquota_lvb);
}
/*
- * Fill request buffer with lvb
+ * Fill request buffer with quota lvb
*/
int qmt_lvbo_fill(struct lu_device *ld, struct ldlm_lock *lock, void *lvb,
int lvblen)
{
- return 0;
+ struct ldlm_resource *res = lock->l_resource;
+ struct lquota_lvb *qlvb = lvb;
+ ENTRY;
+
+ LASSERT(res != NULL);
+
+ if (res->lr_type != LDLM_PLAIN || res->lr_lvb_data == NULL ||
+ res->lr_name.name[LUSTRE_RES_ID_SEQ_OFF] != FID_SEQ_QUOTA_GLB)
+ RETURN(-EINVAL);
+
+ if (res->lr_name.name[LUSTRE_RES_ID_QUOTA_SEQ_OFF] != 0) {
+ /* no ID quota lock associated with UID/GID 0 or with a seq 0,
+ * we are thus dealing with an ID lock. */
+ struct lquota_entry *lqe = res->lr_lvb_data;
+
+ /* return current qunit value & edquot flags in lvb */
+ lqe_getref(lqe);
+ qlvb->lvb_id_qunit = lqe->lqe_qunit;
+ qlvb->lvb_flags = 0;
+ if (lqe->lqe_edquot)
+ qlvb->lvb_flags = LQUOTA_FL_EDQUOT;
+ lqe_putref(lqe);
+ } else {
+ /* global quota lock */
+ struct dt_object *obj = res->lr_lvb_data;
+
+ /* return current version of global index */
+ qlvb->lvb_glb_ver = dt_version_get(lu_env_find(), obj);
+ }
+
+ RETURN(sizeof(struct lquota_lvb));
}
/*
* Free lvb associated with a given ldlm resource
+ * we don't really allocate a lvb, lr_lvb_data just points to
+ * the appropriate backend structures.
*/
int qmt_lvbo_free(struct lu_device *ld, struct ldlm_resource *res)
{
- return 0;
+ ENTRY;
+
+ if (res->lr_lvb_data == NULL)
+ RETURN(0);
+
+ if (res->lr_name.name[LUSTRE_RES_ID_QUOTA_SEQ_OFF] != 0) {
+ struct lquota_entry *lqe = res->lr_lvb_data;
+
+ /* release lqe reference */
+ lqe_putref(lqe);
+ } else {
+ struct dt_object *obj = res->lr_lvb_data;
+ /* release object reference */
+ dt_object_put(lu_env_find(), obj);
+ }
+
+ res->lr_lvb_data = NULL;
+ res->lr_lvb_len = 0;
+
+ RETURN(0);
+}
+
+typedef int (*qmt_glimpse_cb_t)(struct ldlm_lock *, void *);
+
+struct qmt_gl_lock_array {
+ unsigned long q_max;
+ unsigned long q_cnt;
+ struct ldlm_lock **q_locks;
+};
+
+static void qmt_free_lock_array(struct qmt_gl_lock_array *array)
+{
+ int i;
+
+ if (array->q_max == 0) {
+ LASSERT(array->q_locks == NULL);
+ return;
+ }
+
+ for (i = 0; i < array->q_cnt; i++) {
+ LASSERT(array->q_locks[i]);
+ LDLM_LOCK_RELEASE(array->q_locks[i]);
+ array->q_locks[i] = NULL;
+ }
+ array->q_cnt = 0;
+ OBD_FREE(array->q_locks, array->q_max * sizeof(*array->q_locks));
+ array->q_locks = NULL;
+ array->q_max = 0;
+}
+
+static int qmt_alloc_lock_array(struct ldlm_resource *res,
+ struct qmt_gl_lock_array *array,
+ qmt_glimpse_cb_t cb, void *arg)
+{
+ struct list_head *pos;
+ unsigned long count = 0;
+ int fail_cnt = 0;
+ ENTRY;
+
+ LASSERT(!array->q_max && !array->q_cnt && !array->q_locks);
+again:
+ lock_res(res);
+ /* scan list of granted locks */
+ list_for_each(pos, &res->lr_granted) {
+ struct ldlm_lock *lock;
+ int rc;
+
+ lock = list_entry(pos, struct ldlm_lock, l_res_link);
+ LASSERT(lock->l_export);
+
+ if (cb != NULL) {
+ rc = cb(lock, arg);
+ /* slave should not be notified */
+ if (rc == 0)
+ continue;
+ }
+
+ count++;
+ if (array->q_max != 0 && array->q_cnt < array->q_max) {
+ array->q_locks[array->q_cnt] = LDLM_LOCK_GET(lock);
+ array->q_cnt++;
+ }
+ }
+ unlock_res(res);
+
+ if (count > array->q_max) {
+ qmt_free_lock_array(array);
+ if (++fail_cnt > 5)
+ RETURN(-EAGAIN);
+ /*
+ * allocate more slots in case of more qualified locks are
+ * found during next loop
+ */
+ array->q_max = count + count / 2 + 10;
+ count = 0;
+ LASSERT(array->q_locks == NULL && array->q_cnt == 0);
+ OBD_ALLOC(array->q_locks,
+ sizeof(*array->q_locks) * array->q_max);
+ if (array->q_locks == NULL) {
+ array->q_max = 0;
+ RETURN(-ENOMEM);
+ }
+
+ goto again;
+ }
+ RETURN(0);
+}
+
+/*
+ * Send glimpse callback to slaves holding a lock on resource \res.
+ * This is used to notify slaves of new quota settings or to claim quota space
+ * back.
+ *
+ * \param env - is the environment passed by the caller
+ * \param qmt - is the quota master target
+ * \param res - is the dlm resource associated with the quota object
+ * \param desc - is the glimpse descriptor to pack in glimpse callback
+ * \param cb - is the callback function called on every lock and determine
+ * whether a glimpse should be issued
+ * \param arg - is an opaq parameter passed to the callback function
+ */
+static int qmt_glimpse_lock(const struct lu_env *env, struct qmt_device *qmt,
+ struct ldlm_resource *res, union ldlm_gl_desc *desc,
+ qmt_glimpse_cb_t cb, void *arg)
+{
+ struct list_head *tmp, *pos;
+ LIST_HEAD(gl_list);
+ struct qmt_gl_lock_array locks;
+ unsigned long i;
+ int rc = 0;
+ ENTRY;
+
+ memset(&locks, 0, sizeof(locks));
+ rc = qmt_alloc_lock_array(res, &locks, cb, arg);
+ if (rc) {
+ CERROR("%s: failed to allocate glimpse lock array (%d)\n",
+ qmt->qmt_svname, rc);
+ RETURN(rc);
+ }
+
+ for (i = locks.q_cnt; i > 0; i--) {
+ struct ldlm_glimpse_work *work;
+
+ OBD_ALLOC_PTR(work);
+ if (work == NULL) {
+ CERROR("%s: failed to notify a lock.\n",
+ qmt->qmt_svname);
+ continue;
+ }
+
+ list_add_tail(&work->gl_list, &gl_list);
+ work->gl_lock = locks.q_locks[i - 1];
+ work->gl_flags = 0;
+ work->gl_desc = desc;
+
+ locks.q_locks[i - 1] = NULL;
+ locks.q_cnt--;
+ }
+
+ qmt_free_lock_array(&locks);
+
+ if (list_empty(&gl_list)) {
+ CDEBUG(D_QUOTA, "%s: nobody to notify\n", qmt->qmt_svname);
+ RETURN(0);
+ }
+
+ /* issue glimpse callbacks to all connected slaves */
+ rc = ldlm_glimpse_locks(res, &gl_list);
+
+ list_for_each_safe(pos, tmp, &gl_list) {
+ struct ldlm_glimpse_work *work;
+
+ work = list_entry(pos, struct ldlm_glimpse_work, gl_list);
+
+ list_del(&work->gl_list);
+ CERROR("%s: failed to notify %s of new quota settings\n",
+ qmt->qmt_svname,
+ obd_uuid2str(&work->gl_lock->l_export->exp_client_uuid));
+ LDLM_LOCK_RELEASE(work->gl_lock);
+ OBD_FREE_PTR(work);
+ }
+
+ RETURN(rc);
+}
+
+/*
+ * Send glimpse request to all global quota locks to push new quota setting to
+ * slaves.
+ *
+ * \param env - is the environment passed by the caller
+ * \param lqe - is the lquota entry which has new settings
+ * \param ver - is the version associated with the setting change
+ */
+void qmt_glb_lock_notify(const struct lu_env *env, struct lquota_entry *lqe,
+ __u64 ver)
+{
+ struct qmt_thread_info *qti = qmt_info(env);
+ struct qmt_pool_info *pool = lqe2qpi(lqe);
+ struct ldlm_resource *res = NULL;
+ ENTRY;
+
+ lquota_generate_fid(&qti->qti_fid, pool->qpi_rtype,
+ lqe->lqe_site->lqs_qtype);
+
+ /* send glimpse callback to notify slaves of new quota settings */
+ qti->qti_gl_desc.lquota_desc.gl_id = lqe->lqe_id;
+ qti->qti_gl_desc.lquota_desc.gl_flags = 0;
+ if (lqe->lqe_is_default) {
+ qti->qti_gl_desc.lquota_desc.gl_hardlimit = 0;
+ qti->qti_gl_desc.lquota_desc.gl_softlimit = 0;
+ qti->qti_gl_desc.lquota_desc.gl_time = LQUOTA_GRACE_FLAG(0,
+ LQUOTA_FLAG_DEFAULT);
+
+ } else {
+ qti->qti_gl_desc.lquota_desc.gl_hardlimit = lqe->lqe_hardlimit;
+ qti->qti_gl_desc.lquota_desc.gl_softlimit = lqe->lqe_softlimit;
+ qti->qti_gl_desc.lquota_desc.gl_time = lqe->lqe_gracetime;
+ }
+ qti->qti_gl_desc.lquota_desc.gl_ver = ver;
+
+ /* look up ldlm resource associated with global index */
+ fid_build_reg_res_name(&qti->qti_fid, &qti->qti_resid);
+ res = ldlm_resource_get(pool->qpi_qmt->qmt_ns, NULL, &qti->qti_resid,
+ LDLM_PLAIN, 0);
+ if (IS_ERR(res)) {
+ /* this might happen if no slaves have enqueued global quota
+ * locks yet */
+ LQUOTA_DEBUG(lqe, "failed to lookup ldlm resource associated "
+ "with "DFID, PFID(&qti->qti_fid));
+ RETURN_EXIT;
+ }
+
+ qmt_glimpse_lock(env, pool->qpi_qmt, res, &qti->qti_gl_desc,
+ NULL, NULL);
+ ldlm_resource_putref(res);
+ EXIT;
+}
+
+/* Callback function used to select locks that should be glimpsed when
+ * broadcasting the new qunit value */
+static int qmt_id_lock_cb(struct ldlm_lock *lock, void *arg)
+{
+ struct obd_uuid *slv_uuid = arg;
+ struct obd_uuid *uuid = &lock->l_export->exp_client_uuid;
+
+ if (slv_uuid != NULL && obd_uuid_equals(uuid, slv_uuid))
+ RETURN(0);
+ RETURN(+1);
+}
+
+/*
+ * Send glimpse request on per-ID lock to push new qunit value to slave.
+ *
+ * \param env - is the environment passed by the caller
+ * \param qmt - is the quota master target device
+ * \param lqe - is the lquota entry with the new qunit value
+ * \param uuid - is the uuid of the slave acquiring space, if any
+ */
+static void qmt_id_lock_glimpse(const struct lu_env *env,
+ struct qmt_device *qmt,
+ struct lquota_entry *lqe, struct obd_uuid *uuid)
+{
+ struct qmt_thread_info *qti = qmt_info(env);
+ struct qmt_pool_info *pool = lqe2qpi(lqe);
+ struct ldlm_resource *res = NULL;
+ ENTRY;
+
+ if (!lqe->lqe_enforced)
+ RETURN_EXIT;
+
+ lquota_generate_fid(&qti->qti_fid, pool->qpi_rtype,
+ lqe->lqe_site->lqs_qtype);
+ fid_build_quota_res_name(&qti->qti_fid, &lqe->lqe_id, &qti->qti_resid);
+ res = ldlm_resource_get(qmt->qmt_ns, NULL, &qti->qti_resid, LDLM_PLAIN,
+ 0);
+ if (IS_ERR(res)) {
+ /* this might legitimately happens if slaves haven't had the
+ * opportunity to enqueue quota lock yet. */
+ LQUOTA_DEBUG(lqe, "failed to lookup ldlm resource for per-ID "
+ "lock "DFID, PFID(&qti->qti_fid));
+ lqe_write_lock(lqe);
+ if (lqe->lqe_revoke_time == 0 &&
+ lqe->lqe_qunit == pool->qpi_least_qunit)
+ lqe->lqe_revoke_time = ktime_get_seconds();
+ lqe_write_unlock(lqe);
+ RETURN_EXIT;
+ }
+
+ lqe_write_lock(lqe);
+ /* The purpose of glimpse callback on per-ID lock is twofold:
+ * - notify slaves of new qunit value and hope they will release some
+ * spare quota space in return
+ * - notify slaves that master ran out of quota space and there is no
+ * need to send acquire request any more until further notice */
+
+ /* fill glimpse descriptor with lqe settings */
+ if (lqe->lqe_edquot)
+ qti->qti_gl_desc.lquota_desc.gl_flags = LQUOTA_FL_EDQUOT;
+ else
+ qti->qti_gl_desc.lquota_desc.gl_flags = 0;
+ qti->qti_gl_desc.lquota_desc.gl_qunit = lqe->lqe_qunit;
+
+ if (lqe->lqe_revoke_time == 0 &&
+ qti->qti_gl_desc.lquota_desc.gl_qunit == pool->qpi_least_qunit)
+ /* reset lqe_may_rel, it will be updated on glimpse callback
+ * replies if needed */
+ lqe->lqe_may_rel = 0;
+
+ /* The rebalance thread is the only thread which can issue glimpses */
+ LASSERT(!lqe->lqe_gl);
+ lqe->lqe_gl = true;
+ lqe_write_unlock(lqe);
+
+ /* issue glimpse callback to slaves */
+ qmt_glimpse_lock(env, qmt, res, &qti->qti_gl_desc,
+ uuid ? qmt_id_lock_cb : NULL, (void *)uuid);
+
+ lqe_write_lock(lqe);
+ if (lqe->lqe_revoke_time == 0 &&
+ qti->qti_gl_desc.lquota_desc.gl_qunit == pool->qpi_least_qunit &&
+ lqe->lqe_qunit == pool->qpi_least_qunit) {
+ lqe->lqe_revoke_time = ktime_get_seconds();
+ qmt_adjust_edquot(lqe, ktime_get_real_seconds());
+ }
+ LASSERT(lqe->lqe_gl);
+ lqe->lqe_gl = false;
+ lqe_write_unlock(lqe);
+
+ ldlm_resource_putref(res);
+ EXIT;
+}
+
+/*
+ * Schedule a glimpse request on per-ID locks to push new qunit value or
+ * edquot flag to quota slaves.
+ *
+ * \param qmt - is the quota master target device
+ * \param lqe - is the lquota entry with the new qunit value
+ */
+void qmt_id_lock_notify(struct qmt_device *qmt, struct lquota_entry *lqe)
+{
+ bool added = false;
+ ENTRY;
+
+ lqe_getref(lqe);
+ spin_lock(&qmt->qmt_reba_lock);
+ if (!qmt->qmt_stopping && list_empty(&lqe->lqe_link)) {
+ list_add_tail(&lqe->lqe_link, &qmt->qmt_reba_list);
+ added = true;
+ }
+ spin_unlock(&qmt->qmt_reba_lock);
+
+ if (added)
+ wake_up(&qmt->qmt_reba_thread.t_ctl_waitq);
+ else
+ lqe_putref(lqe);
+ EXIT;
+}
+
+/*
+ * The rebalance thread is in charge of sending glimpse callbacks on per-ID
+ * quota locks owned by slaves in order to notify them of:
+ * - a qunit shrink in which case slaves might release quota space back in
+ * glimpse reply.
+ * - set/clear edquot flag used to cache the "quota exhausted" state of the
+ * master. When the flag is set, slaves know that there is no need to
+ * try to acquire quota from the master since this latter has already
+ * distributed all the space.
+ */
+static int qmt_reba_thread(void *arg)
+{
+ struct qmt_device *qmt = (struct qmt_device *)arg;
+ struct ptlrpc_thread *thread = &qmt->qmt_reba_thread;
+ struct lu_env *env;
+ struct lquota_entry *lqe, *tmp;
+ int rc;
+ ENTRY;
+
+ OBD_ALLOC_PTR(env);
+ if (env == NULL) {
+ thread_set_flags(thread, SVC_STOPPED);
+ RETURN(-ENOMEM);
+ }
+
+ rc = lu_env_init(env, LCT_MD_THREAD);
+ if (rc) {
+ CERROR("%s: failed to init env.", qmt->qmt_svname);
+ GOTO(out_env, rc);
+ }
+ rc = lu_env_add(env);
+ if (rc)
+ GOTO(out_env_fini, rc);
+
+ thread_set_flags(thread, SVC_RUNNING);
+ wake_up(&thread->t_ctl_waitq);
+
+ while (1) {
+ wait_event_idle(thread->t_ctl_waitq,
+ !list_empty(&qmt->qmt_reba_list) ||
+ !thread_is_running(thread));
+
+ spin_lock(&qmt->qmt_reba_lock);
+ list_for_each_entry_safe(lqe, tmp, &qmt->qmt_reba_list,
+ lqe_link) {
+ list_del_init(&lqe->lqe_link);
+ spin_unlock(&qmt->qmt_reba_lock);
+
+ if (thread_is_running(thread))
+ qmt_id_lock_glimpse(env, qmt, lqe, NULL);
+
+ lqe_putref(lqe);
+ spin_lock(&qmt->qmt_reba_lock);
+ }
+ spin_unlock(&qmt->qmt_reba_lock);
+
+ if (!thread_is_running(thread))
+ break;
+ }
+ lu_env_remove(env);
+out_env_fini:
+ lu_env_fini(env);
+out_env:
+ OBD_FREE_PTR(env);
+ thread_set_flags(thread, SVC_STOPPED);
+ wake_up(&thread->t_ctl_waitq);
+ RETURN(rc);
+}
+
+/*
+ * Start rebalance thread. Called when the QMT is being setup
+ */
+int qmt_start_reba_thread(struct qmt_device *qmt)
+{
+ struct ptlrpc_thread *thread = &qmt->qmt_reba_thread;
+ struct task_struct *task;
+ ENTRY;
+
+ task = kthread_run(qmt_reba_thread, (void *)qmt,
+ "qmt_reba_%s", qmt->qmt_svname);
+ if (IS_ERR(task)) {
+ CERROR("%s: failed to start rebalance thread (%ld)\n",
+ qmt->qmt_svname, PTR_ERR(task));
+ thread_set_flags(thread, SVC_STOPPED);
+ RETURN(PTR_ERR(task));
+ }
+
+ wait_event_idle(thread->t_ctl_waitq,
+ thread_is_running(thread) || thread_is_stopped(thread));
+
+ RETURN(0);
+}
+
+/*
+ * Stop rebalance thread. Called when the QMT is about to shutdown.
+ */
+void qmt_stop_reba_thread(struct qmt_device *qmt)
+{
+ struct ptlrpc_thread *thread = &qmt->qmt_reba_thread;
+
+ if (!thread_is_stopped(thread)) {
+
+ thread_set_flags(thread, SVC_STOPPING);
+ wake_up(&thread->t_ctl_waitq);
+
+ wait_event_idle(thread->t_ctl_waitq, thread_is_stopped(thread));
+ }
+ LASSERT(list_empty(&qmt->qmt_reba_list));
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff