RETURN(rc);
}
+void mdt_dom_obj_lvb_update(const struct lu_env *env, struct mdt_object *mo,
+ bool increase_only)
+{
+ struct mdt_device *mdt = mdt_dev(mo->mot_obj.lo_dev);
+ struct ldlm_res_id resid;
+ struct ldlm_resource *res;
+
+ fid_build_reg_res_name(mdt_object_fid(mo), &resid);
+ res = ldlm_resource_get(mdt->mdt_namespace, NULL, &resid,
+ LDLM_IBITS, 1);
+ if (IS_ERR(res))
+ return;
+
+ /* Update lvbo data if exists. */
+ if (mdt_dom_lvb_is_valid(res))
+ mdt_dom_disk_lvbo_update(env, mo, res, increase_only);
+ ldlm_resource_putref(res);
+}
+
int mdt_obd_commitrw(const struct lu_env *env, int cmd, struct obd_export *exp,
struct obdo *oa, int objcount, struct obd_ioobj *obj,
struct niobuf_remote *rnb, int npages,
else
obdo_from_la(oa, la, LA_GID | LA_UID);
+ mdt_dom_obj_lvb_update(env, mo, false);
/* don't report overquota flag if we failed before reaching
* commit */
if (old_rc == 0 && (rc == 0 || rc == -EDQUOT)) {
OBD_MD_FLGRPQUOTA;
}
} else if (cmd == OBD_BRW_READ) {
+ /* If oa != NULL then mdt_preprw_read updated the inode
+ * atime and we should update the lvb so that other glimpses
+ * will also get the updated value. bug 5972 */
+ if (oa)
+ mdt_dom_obj_lvb_update(env, mo, true);
rc = mdt_commitrw_read(env, mdt, mo, objcount, npages, lnb);
if (old_rc)
rc = old_rc;
if (rc)
GOTO(out_put, rc);
+ mdt_dom_obj_lvb_update(tsi->tsi_env, mo, false);
mdt_io_counter_incr(tsi->tsi_exp, LPROC_MDT_IO_PUNCH,
tsi->tsi_jobid, 1);
EXIT;
mdt_save_lock(info, &lh, LCK_PW, rc);
out:
mdt_thread_info_fini(info);
- if (rc == 0) {
- struct ldlm_resource *res;
-
- /* we do not call this before to avoid lu_object_find() in
- * ->lvbo_update() holding another reference on the object.
- * otherwise concurrent destroy can make the object unavailable
- * for 2nd lu_object_find() waiting for the first reference
- * to go... deadlock! */
- res = ldlm_resource_get(ns, NULL, &tsi->tsi_resid,
- LDLM_IBITS, 0);
- if (!IS_ERR(res)) {
- ldlm_res_lvbo_update(res, NULL, 0);
- ldlm_resource_putref(res);
- }
+ return rc;
+}
+
+/**
+ * MDT glimpse for Data-on-MDT
+ *
+ * If there is write lock on client then function issues glimpse_ast to get
+ * an actual size from that client.
+ *
+ */
+int mdt_do_glimpse(const struct lu_env *env, struct ldlm_namespace *ns,
+ struct ldlm_resource *res)
+{
+ union ldlm_policy_data policy;
+ struct lustre_handle lockh;
+ enum ldlm_mode mode;
+ struct ldlm_lock *lock;
+ struct ldlm_glimpse_work *gl_work;
+ struct list_head gl_list;
+ int rc;
+
+ ENTRY;
+
+ /* There can be only one write lock covering data, try to match it. */
+ policy.l_inodebits.bits = MDS_INODELOCK_DOM;
+ mode = ldlm_lock_match(ns, LDLM_FL_BLOCK_GRANTED | LDLM_FL_TEST_LOCK,
+ &res->lr_name, LDLM_IBITS, &policy,
+ LCK_PW, &lockh, 0);
+
+ /* There is no PW lock on this object; finished. */
+ if (mode == 0)
+ RETURN(0);
+
+ lock = ldlm_handle2lock(&lockh);
+ if (lock == NULL)
+ RETURN(0);
+
+ /*
+ * This check is for lock taken in mdt_reint_unlink() that does
+ * not have l_glimpse_ast set. So the logic is: if there is a lock
+ * with no l_glimpse_ast set, this object is being destroyed already.
+ * Hence, if you are grabbing DLM locks on the server, always set
+ * non-NULL glimpse_ast (e.g., ldlm_request.c::ldlm_glimpse_ast()).
+ */
+ if (lock->l_glimpse_ast == NULL) {
+ LDLM_DEBUG(lock, "no l_glimpse_ast");
+ GOTO(out, rc = -ENOENT);
}
+
+ OBD_SLAB_ALLOC_PTR_GFP(gl_work, ldlm_glimpse_work_kmem, GFP_ATOMIC);
+ if (!gl_work)
+ GOTO(out, rc = -ENOMEM);
+
+ /* Populate the gl_work structure.
+ * Grab additional reference on the lock which will be released in
+ * ldlm_work_gl_ast_lock() */
+ gl_work->gl_lock = LDLM_LOCK_GET(lock);
+ /* The glimpse callback is sent to one single IO lock. As a result,
+ * the gl_work list is just composed of one element */
+ INIT_LIST_HEAD(&gl_list);
+ list_add_tail(&gl_work->gl_list, &gl_list);
+ /* There is actually no need for a glimpse descriptor when glimpsing
+ * IO locks */
+ gl_work->gl_desc = NULL;
+ /* the ldlm_glimpse_work structure is allocated on the stack */
+ gl_work->gl_flags = LDLM_GL_WORK_SLAB_ALLOCATED;
+
+ ldlm_glimpse_locks(res, &gl_list); /* this will update the LVB */
+
+ /* If the list is not empty, we failed to glimpse a lock and
+ * must clean it up. Usually due to a race with unlink.*/
+ if (!list_empty(&gl_list)) {
+ LDLM_LOCK_RELEASE(lock);
+ OBD_SLAB_FREE_PTR(gl_work, ldlm_glimpse_work_kmem);
+ }
+ rc = 0;
+ EXIT;
+out:
+ LDLM_LOCK_PUT(lock);
return rc;
}
+static void mdt_lvb2body(struct ldlm_resource *res, struct mdt_body *mb)
+{
+ struct ost_lvb *res_lvb;
+
+ lock_res(res);
+ res_lvb = res->lr_lvb_data;
+ mb->mbo_size = res_lvb->lvb_size;
+ mb->mbo_blocks = res_lvb->lvb_blocks;
+ mb->mbo_mtime = res_lvb->lvb_mtime;
+ mb->mbo_ctime = res_lvb->lvb_ctime;
+ mb->mbo_atime = res_lvb->lvb_atime;
+
+ CDEBUG(D_DLMTRACE, "size %llu\n", res_lvb->lvb_size);
+
+ mb->mbo_valid |= OBD_MD_FLATIME | OBD_MD_FLCTIME | OBD_MD_FLMTIME |
+ OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
+ unlock_res(res);
+}
+
+/**
+ * MDT glimpse for Data-on-MDT
+ *
+ * This function is called when MDT get attributes for the DoM object.
+ * If there is write lock on client then function issues glimpse_ast to get
+ * an actual size from that client.
+ */
+int mdt_dom_object_size(const struct lu_env *env, struct mdt_device *mdt,
+ const struct lu_fid *fid, struct mdt_body *mb,
+ bool dom_lock)
+{
+ struct ldlm_res_id resid;
+ struct ldlm_resource *res;
+ int rc = 0;
+
+ ENTRY;
+
+ fid_build_reg_res_name(fid, &resid);
+ res = ldlm_resource_get(mdt->mdt_namespace, NULL, &resid,
+ LDLM_IBITS, 1);
+ if (IS_ERR(res) || res->lr_lvb_data == NULL)
+ RETURN(-ENOENT);
+
+ /* if there is no DOM bit in the lock then glimpse is needed
+ * to return valid size */
+ if (!dom_lock) {
+ rc = mdt_do_glimpse(env, mdt->mdt_namespace, res);
+ if (rc < 0)
+ GOTO(out, rc);
+ }
+
+ /* Update lvbo data if DoM lock returned or if LVB is not yet valid. */
+ if (dom_lock || !mdt_dom_lvb_is_valid(res))
+ mdt_dom_lvbo_update(res, NULL, NULL, false);
+
+ mdt_lvb2body(res, mb);
+out:
+ ldlm_resource_putref(res);
+ RETURN(rc);
+}
+
+/**
+ * MDT DoM lock intent policy (glimpse)
+ *
+ * Intent policy is called when lock has an intent, for DoM file that
+ * means glimpse lock and policy fills Lock Value Block (LVB).
+ *
+ * If already granted lock is found it will be placed in \a lockp and
+ * returned back to caller function.
+ *
+ * \param[in] tsi session info
+ * \param[in,out] lockp pointer to the lock
+ * \param[in] flags LDLM flags
+ *
+ * \retval ELDLM_LOCK_REPLACED if already granted lock was found
+ * and placed in \a lockp
+ * \retval ELDLM_LOCK_ABORTED in other cases except error
+ * \retval negative value on error
+ */
+int mdt_glimpse_enqueue(struct mdt_thread_info *mti, struct ldlm_namespace *ns,
+ struct ldlm_lock **lockp, __u64 flags)
+{
+ struct ldlm_lock *lock = *lockp;
+ struct ldlm_resource *res = lock->l_resource;
+ ldlm_processing_policy policy;
+ struct ldlm_reply *rep;
+ struct mdt_body *mbo;
+ int rc;
+
+ ENTRY;
+
+ policy = ldlm_get_processing_policy(res);
+ LASSERT(policy != NULL);
+
+ req_capsule_set_size(mti->mti_pill, &RMF_MDT_MD, RCL_SERVER, 0);
+ req_capsule_set_size(mti->mti_pill, &RMF_ACL, RCL_SERVER, 0);
+ rc = req_capsule_server_pack(mti->mti_pill);
+ if (rc)
+ RETURN(err_serious(rc));
+
+ rep = req_capsule_server_get(mti->mti_pill, &RMF_DLM_REP);
+ if (rep == NULL)
+ RETURN(-EPROTO);
+
+ mbo = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
+ if (mbo == NULL)
+ RETURN(-EPROTO);
+
+ lock_res(res);
+ /* Check if this is a resend case (MSG_RESENT is set on RPC) and a
+ * lock was found by ldlm_handle_enqueue(); if so no need to grant
+ * it again. */
+ if (flags & LDLM_FL_RESENT) {
+ rc = LDLM_ITER_CONTINUE;
+ } else {
+ __u64 tmpflags = 0;
+ enum ldlm_error err;
+
+ rc = policy(lock, &tmpflags, 0, &err, NULL);
+ check_res_locked(res);
+ }
+ unlock_res(res);
+
+ /* The lock met with no resistance; we're finished. */
+ if (rc == LDLM_ITER_CONTINUE) {
+ GOTO(fill_mbo, rc = ELDLM_LOCK_REPLACED);
+ } else if (flags & LDLM_FL_BLOCK_NOWAIT) {
+ /* LDLM_FL_BLOCK_NOWAIT means it is for AGL. Do not send glimpse
+ * callback for glimpse size. The real size user will trigger
+ * the glimpse callback when necessary. */
+ GOTO(fill_mbo, rc = ELDLM_LOCK_ABORTED);
+ }
+
+ rc = mdt_do_glimpse(mti->mti_env, ns, res);
+ if (rc == -ENOENT) {
+ /* We are racing with unlink(); just return -ENOENT */
+ rep->lock_policy_res2 = ptlrpc_status_hton(-ENOENT);
+ rc = 0;
+ } else if (rc == -EINVAL) {
+ /* this is possible is client lock has been cancelled but
+ * still exists on server. If that lock was found on server
+ * as only conflicting lock then the client has already
+ * size authority and glimpse is not needed. */
+ CDEBUG(D_DLMTRACE, "Glimpse from the client owning lock\n");
+ rc = 0;
+ } else if (rc < 0) {
+ RETURN(rc);
+ }
+ rc = ELDLM_LOCK_ABORTED;
+fill_mbo:
+ /* LVB can be without valid data in case of DOM */
+ if (!mdt_dom_lvb_is_valid(res))
+ mdt_dom_lvbo_update(res, lock, NULL, false);
+ mdt_lvb2body(res, mbo);
+ RETURN(rc);
+}
+
+int mdt_brw_enqueue(struct mdt_thread_info *mti, struct ldlm_namespace *ns,
+ struct ldlm_lock **lockp, __u64 flags)
+{
+ struct tgt_session_info *tsi = tgt_ses_info(mti->mti_env);
+ struct lu_fid *fid = &tsi->tsi_fid;
+ struct ldlm_lock *lock = *lockp;
+ struct ldlm_resource *res = lock->l_resource;
+ struct ldlm_reply *rep;
+ struct mdt_body *mbo;
+ struct mdt_lock_handle *lhc = &mti->mti_lh[MDT_LH_RMT];
+ struct mdt_object *mo;
+ int rc = 0;
+
+ ENTRY;
+
+ /* Get lock from request for possible resent case. */
+ mdt_intent_fixup_resent(mti, *lockp, lhc, flags);
+ req_capsule_set_size(mti->mti_pill, &RMF_MDT_MD, RCL_SERVER, 0);
+ req_capsule_set_size(mti->mti_pill, &RMF_ACL, RCL_SERVER, 0);
+ rc = req_capsule_server_pack(mti->mti_pill);
+ if (rc)
+ RETURN(err_serious(rc));
+
+ rep = req_capsule_server_get(mti->mti_pill, &RMF_DLM_REP);
+ if (rep == NULL)
+ RETURN(-EPROTO);
+
+ mbo = req_capsule_server_get(mti->mti_pill, &RMF_MDT_BODY);
+ if (mbo == NULL)
+ RETURN(-EPROTO);
+
+ fid_extract_from_res_name(fid, &res->lr_name);
+ mo = mdt_object_find(mti->mti_env, mti->mti_mdt, fid);
+ if (unlikely(IS_ERR(mo)))
+ RETURN(PTR_ERR(mo));
+
+ if (!mdt_object_exists(mo))
+ GOTO(out, rc = -ENOENT);
+
+ if (mdt_object_remote(mo))
+ GOTO(out, rc = -EPROTO);
+
+ /* resent case */
+ if (!lustre_handle_is_used(&lhc->mlh_reg_lh)) {
+ mdt_lock_handle_init(lhc);
+ mdt_lock_reg_init(lhc, (*lockp)->l_req_mode);
+ /* This will block MDT thread but it should be fine until
+ * client caches small amount of data for DoM, which should be
+ * smaller than one BRW RPC and should be able to be
+ * piggybacked by lock cancel RPC.
+ * If the client could hold the lock too long, this code can be
+ * revised to call mdt_object_lock_try(). And if fails, it will
+ * return ELDLM_OK here and fall back into normal lock enqueue
+ * process.
+ */
+ rc = mdt_object_lock(mti, mo, lhc, MDS_INODELOCK_DOM);
+ if (rc)
+ GOTO(out, rc);
+ }
+
+ if (!mdt_dom_lvb_is_valid(res)) {
+ rc = mdt_dom_lvb_alloc(res);
+ if (rc)
+ GOTO(out_fail, rc);
+ mdt_dom_disk_lvbo_update(mti->mti_env, mo, res, false);
+ }
+ mdt_lvb2body(res, mbo);
+out_fail:
+ rep->lock_policy_res2 = clear_serious(rc);
+ if (rep->lock_policy_res2) {
+ lhc->mlh_reg_lh.cookie = 0ull;
+ GOTO(out, rc = ELDLM_LOCK_ABORTED);
+ }
+
+ rc = mdt_intent_lock_replace(mti, lockp, lhc, flags, rc);
+out:
+ mdt_object_put(mti->mti_env, mo);
+ RETURN(rc);
+}
+
+void mdt_dom_discard_data(struct mdt_thread_info *info,
+ const struct lu_fid *fid)
+{
+ struct mdt_device *mdt = info->mti_mdt;
+ union ldlm_policy_data *policy = &info->mti_policy;
+ struct ldlm_res_id *res_id = &info->mti_res_id;
+ struct lustre_handle dom_lh;
+ __u64 flags = LDLM_FL_AST_DISCARD_DATA;
+ __u64 rc = 0;
+
+ policy->l_inodebits.bits = MDS_INODELOCK_DOM;
+ policy->l_inodebits.try_bits = 0;
+ fid_build_reg_res_name(fid, res_id);
+
+ /* Tell the clients that the object is gone now and that they should
+ * throw away any cached pages. */
+ rc = ldlm_cli_enqueue_local(mdt->mdt_namespace, res_id, LDLM_IBITS,
+ policy, LCK_PW, &flags, ldlm_blocking_ast,
+ ldlm_completion_ast, NULL, NULL, 0,
+ LVB_T_NONE, NULL, &dom_lh);
+
+ /* We only care about the side-effects, just drop the lock. */
+ if (rc == ELDLM_OK)
+ ldlm_lock_decref(&dom_lh, LCK_PW);
+}
+
git://git.whamcloud.com / fs / lustre-release.git / blobdiff