/* * GPL HEADER START * * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 only, * as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License version 2 for more details (a copy is included * in the LICENSE file that accompanied this code). * * You should have received a copy of the GNU General Public License * version 2 along with this program; If not, see * http://www.gnu.org/licenses/gpl-2.0.html * * GPL HEADER END */ /* * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. * Use is subject to license terms. * * Copyright (c) 2012, 2017, Intel Corporation. */ /* * This file is part of Lustre, http://www.lustre.org/ * Lustre is a trademark of Sun Microsystems, Inc. * * lustre/osp/osp_dev.c * * Author: Alex Zhuravlev * Author: Mikhail Pershin * Author: Di Wang */ /* * The Object Storage Proxy (OSP) module provides an implementation of * the DT API for remote MDTs and OSTs. Every local OSP device (or * object) is a proxy for a remote OSD device (or object). Thus OSP * converts DT operations into RPCs, which are sent to the OUT service * on a remote target, converted back to DT operations, and * executed. Of course there are many ways in which this description * is inaccurate but it's a good enough mental model. OSP is used by * the MDT stack in several ways: * * - OSP devices allocate FIDs for the stripe sub-objects of a striped * file or directory. * * - OSP objects represent the remote MDT and OST objects that are * the stripes of a striped object. * * - OSP devices log, send, and track synchronous operations (setattr * and unlink) to remote targets. * * - OSP objects are the bottom slice of the compound LU object * representing a remote MDT object: MDT/MDD/LOD/OSP. * * - OSP objects are used by LFSCK to represent remote OST objects * during the verification of MDT-OST consistency. * * - OSP devices batch idempotent requests (declare_attr_get() and * declare_xattr_get()) to the remote target and cache their results. * * In addition the OSP layer implements a subset of the OBD device API * to support being a client of a remote target, connecting to other * layers, and FID allocation. */ #define DEBUG_SUBSYSTEM S_MDS #include #include #include #include #include #include #include "osp_internal.h" /* Slab for OSP object allocation */ struct kmem_cache *osp_object_kmem; static struct lu_kmem_descr osp_caches[] = { { .ckd_cache = &osp_object_kmem, .ckd_name = "osp_obj", .ckd_size = sizeof(struct osp_object) }, { .ckd_cache = NULL } }; /** * Implementation of lu_device_operations::ldo_object_alloc * * Allocates an OSP object in memory, whose FID is on the remote target. * * \param[in] env execution environment * \param[in] hdr The header of the object stack. If it is NULL, it * means the object is not built from top device, i.e. * it is a sub-stripe object of striped directory or * an OST object. * \param[in] d OSP device * * \retval object object being created if the creation succeed. * \retval NULL NULL if the creation failed. */ static struct lu_object *osp_object_alloc(const struct lu_env *env, const struct lu_object_header *hdr, struct lu_device *d) { struct lu_object_header *h = NULL; struct osp_object *o; struct lu_object *l; OBD_SLAB_ALLOC_PTR_GFP(o, osp_object_kmem, GFP_NOFS); if (o != NULL) { l = &o->opo_obj.do_lu; /* If hdr is NULL, it means the object is not built * from the top dev(MDT/OST), usually it happens when * building striped object, like data object on MDT or * striped object for directory */ if (hdr == NULL) { h = &o->opo_header; lu_object_header_init(h); dt_object_init(&o->opo_obj, h, d); lu_object_add_top(h, l); } else { dt_object_init(&o->opo_obj, h, d); } l->lo_ops = &osp_lu_obj_ops; return l; } else { return NULL; } } /** * Find or create the local object * * Finds or creates the local file referenced by \a reg_id and return the * attributes of the local file. * * \param[in] env execution environment * \param[in] osp OSP device * \param[out] attr attributes of the object * \param[in] reg_id the local object ID of the file. It will be used * to compose a local FID{FID_SEQ_LOCAL_FILE, reg_id, 0} * to identify the object. * * \retval object object(dt_object) found or created * \retval ERR_PTR(errno) ERR_PTR(errno) if not get the object. */ static struct dt_object *osp_find_or_create_local_file(const struct lu_env *env, struct osp_device *osp, struct lu_attr *attr, __u32 reg_id) { struct osp_thread_info *osi = osp_env_info(env); struct dt_object_format dof = { 0 }; struct dt_object *dto; int rc; ENTRY; lu_local_obj_fid(&osi->osi_fid, reg_id); attr->la_valid = LA_MODE; attr->la_mode = S_IFREG | 0644; dof.dof_type = DFT_REGULAR; /* Find or create the local object by osi_fid. */ dto = dt_find_or_create(env, osp->opd_storage, &osi->osi_fid, &dof, attr); if (IS_ERR(dto)) RETURN(dto); /* Get attributes of the local object. */ rc = dt_attr_get(env, dto, attr); if (rc) { CERROR("%s: can't be initialized: rc = %d\n", osp->opd_obd->obd_name, rc); dt_object_put(env, dto); RETURN(ERR_PTR(rc)); } RETURN(dto); } /** * Write data buffer to a local file object. * * \param[in] env execution environment * \param[in] osp OSP device * \param[in] dt_obj object written to * \param[in] buf buffer containing byte array and length * \param[in] offset write offset in the object in bytes * * \retval 0 0 if write succeed * \retval -EFAULT -EFAULT if only part of buffer is written. * \retval negative other negative errno if write failed. */ static int osp_write_local_file(const struct lu_env *env, struct osp_device *osp, struct dt_object *dt_obj, struct lu_buf *buf, loff_t offset) { struct thandle *th; int rc; if (osp->opd_storage->dd_rdonly) RETURN(0); th = dt_trans_create(env, osp->opd_storage); if (IS_ERR(th)) RETURN(PTR_ERR(th)); rc = dt_declare_record_write(env, dt_obj, buf, offset, th); if (rc) GOTO(out, rc); rc = dt_trans_start_local(env, osp->opd_storage, th); if (rc) GOTO(out, rc); rc = dt_record_write(env, dt_obj, buf, &offset, th); out: dt_trans_stop(env, osp->opd_storage, th); RETURN(rc); } /** * Initialize last ID object. * * This function initializes the LAST_ID file, which stores the current last * used id of data objects. The MDT will use the last used id and the last_seq * (\see osp_init_last_seq()) to synchronize the precreate object cache with * OSTs. * * \param[in] env execution environment * \param[in] osp OSP device * * \retval 0 0 if initialization succeed * \retval negative negative errno if initialization failed */ static int osp_init_last_objid(const struct lu_env *env, struct osp_device *osp) { struct osp_thread_info *osi = osp_env_info(env); struct lu_fid *fid = &osp->opd_last_used_fid; struct dt_object *dto; int rc = -EFAULT; ENTRY; dto = osp_find_or_create_local_file(env, osp, &osi->osi_attr, MDD_LOV_OBJ_OID); if (IS_ERR(dto)) RETURN(PTR_ERR(dto)); osp_objid_buf_prep(&osi->osi_lb, &osi->osi_off, &osp->opd_last_id, osp->opd_index); /* object will be released in device cleanup path */ if (osi->osi_attr.la_size >= (osi->osi_off + osi->osi_lb.lb_len)) { rc = dt_record_read(env, dto, &osi->osi_lb, &osi->osi_off); if (rc != 0 && rc != -EFAULT) GOTO(out, rc); /* In case of idif bits 32-48 go to f_seq * (see osp_init_last_seq). So don't care * about u64->u32 convertion. */ fid->f_oid = osp->opd_last_id; } if (rc == -EFAULT) { /* fresh LAST_ID */ osp->opd_last_id = 0; fid->f_oid = 0; rc = osp_write_local_file(env, osp, dto, &osi->osi_lb, osi->osi_off); if (rc != 0) GOTO(out, rc); } osp->opd_last_used_oid_file = dto; RETURN(0); out: /* object will be released in device cleanup path */ CERROR("%s: can't initialize lov_objid: rc = %d\n", osp->opd_obd->obd_name, rc); dt_object_put(env, dto); osp->opd_last_used_oid_file = NULL; RETURN(rc); } /** * Initialize last sequence object. * * This function initializes the LAST_SEQ file in the local OSD, which stores * the current last used sequence of data objects. The MDT will use the last * sequence and last id (\see osp_init_last_objid()) to synchronize the * precreate object cache with OSTs. * * \param[in] env execution environment * \param[in] osp OSP device * * \retval 0 0 if initialization succeed * \retval negative negative errno if initialization failed */ static int osp_init_last_seq(const struct lu_env *env, struct osp_device *osp) { struct osp_thread_info *osi = osp_env_info(env); struct lu_fid *fid = &osp->opd_last_used_fid; struct dt_object *dto; int rc = -EFAULT; ENTRY; dto = osp_find_or_create_local_file(env, osp, &osi->osi_attr, MDD_LOV_OBJ_OSEQ); if (IS_ERR(dto)) RETURN(PTR_ERR(dto)); osp_objseq_buf_prep(&osi->osi_lb, &osi->osi_off, &fid->f_seq, osp->opd_index); /* object will be released in device cleanup path */ if (osi->osi_attr.la_size >= (osi->osi_off + osi->osi_lb.lb_len)) { rc = dt_record_read(env, dto, &osi->osi_lb, &osi->osi_off); if (rc != 0 && rc != -EFAULT) GOTO(out, rc); if (fid_is_idif(fid)) fid->f_seq = fid_idif_seq(osp->opd_last_id, osp->opd_index); } if (rc == -EFAULT) { /* fresh OSP */ fid->f_seq = 0; rc = osp_write_local_file(env, osp, dto, &osi->osi_lb, osi->osi_off); if (rc != 0) GOTO(out, rc); } osp->opd_last_used_seq_file = dto; RETURN(0); out: /* object will be released in device cleanup path */ CERROR("%s: can't initialize lov_seq: rc = %d\n", osp->opd_obd->obd_name, rc); dt_object_put(env, dto); osp->opd_last_used_seq_file = NULL; RETURN(rc); } /** * Initialize last OID and sequence object. * * If the MDT is just upgraded to 2.4 from the lower version, where the * LAST_SEQ file does not exist, the file will be created and IDIF sequence * will be written into the file. * * \param[in] env execution environment * \param[in] osp OSP device * * \retval 0 0 if initialization succeed * \retval negative negative error if initialization failed */ static int osp_last_used_init(const struct lu_env *env, struct osp_device *osp) { struct osp_thread_info *osi = osp_env_info(env); int rc; ENTRY; fid_zero(&osp->opd_last_used_fid); rc = osp_init_last_objid(env, osp); if (rc < 0) { CERROR("%s: Can not get ids %d from old objid!\n", osp->opd_obd->obd_name, rc); RETURN(rc); } rc = osp_init_last_seq(env, osp); if (rc < 0) { CERROR("%s: Can not get sequence %d from old objseq!\n", osp->opd_obd->obd_name, rc); GOTO(out, rc); } if (fid_oid(&osp->opd_last_used_fid) != 0 && fid_seq(&osp->opd_last_used_fid) == 0) { /* Just upgrade from the old version, * set the seq to be IDIF */ osp->opd_last_used_fid.f_seq = fid_idif_seq(fid_oid(&osp->opd_last_used_fid), osp->opd_index); osp_objseq_buf_prep(&osi->osi_lb, &osi->osi_off, &osp->opd_last_used_fid.f_seq, osp->opd_index); rc = osp_write_local_file(env, osp, osp->opd_last_used_seq_file, &osi->osi_lb, osi->osi_off); if (rc) { CERROR("%s : Can not write seq file: rc = %d\n", osp->opd_obd->obd_name, rc); GOTO(out, rc); } } if (!fid_is_zero(&osp->opd_last_used_fid) && !fid_is_sane(&osp->opd_last_used_fid)) { CERROR("%s: Got invalid FID "DFID"\n", osp->opd_obd->obd_name, PFID(&osp->opd_last_used_fid)); GOTO(out, rc = -EINVAL); } osp_fid_to_obdid(&osp->opd_last_used_fid, &osp->opd_last_id); CDEBUG(D_INFO, "%s: Init last used fid "DFID"\n", osp->opd_obd->obd_name, PFID(&osp->opd_last_used_fid)); out: if (rc != 0) { if (osp->opd_last_used_oid_file != NULL) { dt_object_put(env, osp->opd_last_used_oid_file); osp->opd_last_used_oid_file = NULL; } if (osp->opd_last_used_seq_file != NULL) { dt_object_put(env, osp->opd_last_used_seq_file); osp->opd_last_used_seq_file = NULL; } } RETURN(rc); } /** * Release the last sequence and OID file objects in OSP device. * * \param[in] env execution environment * \param[in] osp OSP device */ static void osp_last_used_fini(const struct lu_env *env, struct osp_device *osp) { /* release last_used file */ if (osp->opd_last_used_oid_file != NULL) { dt_object_put(env, osp->opd_last_used_oid_file); osp->opd_last_used_oid_file = NULL; } if (osp->opd_last_used_seq_file != NULL) { dt_object_put(env, osp->opd_last_used_seq_file); osp->opd_last_used_seq_file = NULL; } } /** * Disconnects the connection between OSP and its correspondent MDT or OST, and * the import will be marked as inactive. It will only be called during OSP * cleanup process. * * \param[in] d OSP device being disconnected * * \retval 0 0 if disconnection succeed * \retval negative negative errno if disconnection failed */ static int osp_disconnect(struct osp_device *d) { struct obd_device *obd = d->opd_obd; struct obd_import *imp; int rc = 0; imp = obd->u.cli.cl_import; /* Mark import deactivated now, so we don't try to reconnect if any * of the cleanup RPCs fails (e.g. ldlm cancel, etc). We don't * fully deactivate the import, or that would drop all requests. */ LASSERT(imp != NULL); spin_lock(&imp->imp_lock); imp->imp_deactive = 1; spin_unlock(&imp->imp_lock); ptlrpc_deactivate_import(imp); /* Some non-replayable imports (MDS's OSCs) are pinged, so just * delete it regardless. (It's safe to delete an import that was * never added.) */ (void)ptlrpc_pinger_del_import(imp); rc = ptlrpc_disconnect_import(imp, 0); if (rc != 0) CERROR("%s: can't disconnect: rc = %d\n", obd->obd_name, rc); ptlrpc_invalidate_import(imp); RETURN(rc); } /** * Initialize the osp_update structure in OSP device * * Allocate osp update structure and start update thread. * * \param[in] osp OSP device * * \retval 0 if initialization succeeds. * \retval negative errno if initialization fails. */ static int osp_update_init(struct osp_device *osp) { struct l_wait_info lwi = { 0 }; struct task_struct *task; ENTRY; LASSERT(osp->opd_connect_mdt); if (osp->opd_storage->dd_rdonly) RETURN(0); OBD_ALLOC_PTR(osp->opd_update); if (osp->opd_update == NULL) RETURN(-ENOMEM); init_waitqueue_head(&osp->opd_update_thread.t_ctl_waitq); init_waitqueue_head(&osp->opd_update->ou_waitq); spin_lock_init(&osp->opd_update->ou_lock); INIT_LIST_HEAD(&osp->opd_update->ou_list); osp->opd_update->ou_rpc_version = 1; osp->opd_update->ou_version = 1; osp->opd_update->ou_generation = 0; /* start thread handling sending updates to the remote MDT */ task = kthread_run(osp_send_update_thread, osp, "osp_up%u-%u", osp->opd_index, osp->opd_group); if (IS_ERR(task)) { int rc = PTR_ERR(task); OBD_FREE_PTR(osp->opd_update); osp->opd_update = NULL; CERROR("%s: can't start precreate thread: rc = %d\n", osp->opd_obd->obd_name, rc); RETURN(rc); } l_wait_event(osp->opd_update_thread.t_ctl_waitq, osp_send_update_thread_running(osp) || osp_send_update_thread_stopped(osp), &lwi); RETURN(0); } /** * Finialize osp_update structure in OSP device * * Stop the OSP update sending thread, then delete the left * osp thandle in the sending list. * * \param [in] osp OSP device. */ static void osp_update_fini(const struct lu_env *env, struct osp_device *osp) { struct osp_update_request *our; struct osp_update_request *tmp; struct osp_updates *ou = osp->opd_update; if (ou == NULL) return; osp->opd_update_thread.t_flags = SVC_STOPPING; wake_up(&ou->ou_waitq); wait_event(osp->opd_update_thread.t_ctl_waitq, osp->opd_update_thread.t_flags & SVC_STOPPED); /* Remove the left osp thandle from the list */ spin_lock(&ou->ou_lock); list_for_each_entry_safe(our, tmp, &ou->ou_list, our_list) { list_del_init(&our->our_list); LASSERT(our->our_th != NULL); osp_trans_callback(env, our->our_th, -EIO); /* our will be destroyed in osp_thandle_put() */ osp_thandle_put(env, our->our_th); } spin_unlock(&ou->ou_lock); OBD_FREE_PTR(ou); osp->opd_update = NULL; } /** * Cleanup OSP, which includes disconnect import, cleanup unlink log, stop * precreate threads etc. * * \param[in] env execution environment. * \param[in] d OSP device being disconnected. * * \retval 0 0 if cleanup succeed * \retval negative negative errno if cleanup failed */ static int osp_shutdown(const struct lu_env *env, struct osp_device *d) { int rc = 0; ENTRY; LASSERT(env); rc = osp_disconnect(d); osp_statfs_fini(d); if (!d->opd_connect_mdt) { /* stop sync thread */ osp_sync_fini(d); /* stop precreate thread */ osp_precreate_fini(d); /* release last_used file */ osp_last_used_fini(env, d); } obd_fid_fini(d->opd_obd); RETURN(rc); } /** * Implementation of osp_lu_ops::ldo_process_config * * This function processes config log records in OSP layer. It is usually * called from the top layer of MDT stack, and goes through the stack by calling * ldo_process_config of next layer. * * \param[in] env execution environment * \param[in] dev lu_device of OSP * \param[in] lcfg config log * * \retval 0 0 if the config log record is executed correctly. * \retval negative negative errno if the record execution fails. */ static int osp_process_config(const struct lu_env *env, struct lu_device *dev, struct lustre_cfg *lcfg) { struct osp_device *d = lu2osp_dev(dev); struct dt_device *dt = lu2dt_dev(dev); struct obd_device *obd = d->opd_obd; ssize_t count; int rc; ENTRY; switch (lcfg->lcfg_command) { case LCFG_PRE_CLEANUP: rc = osp_disconnect(d); osp_update_fini(env, d); if (obd->obd_namespace != NULL) ldlm_namespace_free_prior(obd->obd_namespace, NULL, 1); break; case LCFG_CLEANUP: lu_dev_del_linkage(dev->ld_site, dev); rc = osp_shutdown(env, d); break; case LCFG_PARAM: count = class_modify_config(lcfg, d->opd_connect_mdt ? PARAM_OSP : PARAM_OSC, &dt->dd_kobj); if (count < 0) { /* class_modify_config() haven't found matching * parameter and returned an error so that layer(s) * below could use that. But OSP is the bottom, so * just ignore it */ CERROR("%s: unknown param %s\n", (char *)lustre_cfg_string(lcfg, 0), (char *)lustre_cfg_string(lcfg, 1)); } rc = 0; break; default: CERROR("%s: unknown command %u\n", (char *)lustre_cfg_string(lcfg, 0), lcfg->lcfg_command); rc = 0; break; } RETURN(rc); } /** * Implementation of osp_lu_ops::ldo_recovery_complete * * This function is called after recovery is finished, and OSP layer * will wake up precreate thread here. * * \param[in] env execution environment * \param[in] dev lu_device of OSP * * \retval 0 0 unconditionally */ static int osp_recovery_complete(const struct lu_env *env, struct lu_device *dev) { struct osp_device *osp = lu2osp_dev(dev); ENTRY; osp->opd_recovery_completed = 1; if (!osp->opd_connect_mdt && osp->opd_pre != NULL) wake_up(&osp->opd_pre_waitq); RETURN(0); } const struct lu_device_operations osp_lu_ops = { .ldo_object_alloc = osp_object_alloc, .ldo_process_config = osp_process_config, .ldo_recovery_complete = osp_recovery_complete, }; /** * Implementation of dt_device_operations::dt_statfs * * This function provides statfs status (for precreation) from * corresponding OST. Note: this function only retrieves the status * from the OSP device, and the real statfs RPC happens inside * precreate thread (\see osp_statfs_update). Note: OSP for MDT does * not need to retrieve statfs data for now. * * \param[in] env execution environment. * \param[in] dev dt_device of OSP. * \param[out] sfs holds the retrieved statfs data. * * \retval 0 0 statfs data was retrieved successfully or * retrieval was not needed * \retval negative negative errno if get statfs failed. */ static int osp_statfs(const struct lu_env *env, struct dt_device *dev, struct obd_statfs *sfs) { struct osp_device *d = dt2osp_dev(dev); struct obd_import *imp = d->opd_obd->u.cli.cl_import; ENTRY; if (imp->imp_state == LUSTRE_IMP_CLOSED) RETURN(-ESHUTDOWN); if (unlikely(d->opd_imp_active == 0)) RETURN(-ENOTCONN); /* return recently updated data */ *sfs = d->opd_statfs; if (d->opd_pre == NULL) RETURN(0); /* * layer above osp (usually lod) can use ffree to estimate * how many objects are available for immediate creation */ spin_lock(&d->opd_pre_lock); LASSERTF(fid_seq(&d->opd_pre_last_created_fid) == fid_seq(&d->opd_pre_used_fid), "last_created "DFID", next_fid "DFID"\n", PFID(&d->opd_pre_last_created_fid), PFID(&d->opd_pre_used_fid)); sfs->os_fprecreated = fid_oid(&d->opd_pre_last_created_fid) - fid_oid(&d->opd_pre_used_fid); sfs->os_fprecreated -= d->opd_pre_reserved; LASSERTF(sfs->os_fprecreated <= OST_MAX_PRECREATE * 2, "last_created "DFID", next_fid "DFID", reserved %llu\n", PFID(&d->opd_pre_last_created_fid), PFID(&d->opd_pre_used_fid), d->opd_pre_reserved); spin_unlock(&d->opd_pre_lock); CDEBUG(D_OTHER, "%s: %llu blocks, %llu free, %llu avail, " "%llu files, %llu free files\n", d->opd_obd->obd_name, sfs->os_blocks, sfs->os_bfree, sfs->os_bavail, sfs->os_files, sfs->os_ffree); RETURN(0); } static int osp_sync_timeout(void *data) { return 1; } /** * Implementation of dt_device_operations::dt_sync * * This function synchronizes the OSP cache to the remote target. It wakes * up unlink log threads and sends out unlink records to the remote OST. * * \param[in] env execution environment * \param[in] dev dt_device of OSP * * \retval 0 0 if synchronization succeeds * \retval negative negative errno if synchronization fails */ static int osp_sync(const struct lu_env *env, struct dt_device *dev) { struct osp_device *d = dt2osp_dev(dev); struct l_wait_info lwi = { 0 }; time64_t start = ktime_get_seconds(); int recs, rc = 0; u64 old; ENTRY; /* No Sync between MDTs yet. */ if (d->opd_connect_mdt) RETURN(0); recs = atomic_read(&d->opd_sync_changes); old = atomic64_read(&d->opd_sync_processed_recs); osp_sync_force(env, dt2osp_dev(dev)); if (unlikely(d->opd_imp_active == 0)) RETURN(-ENOTCONN); down_write(&d->opd_async_updates_rwsem); CDEBUG(D_OTHER, "%s: async updates %d\n", d->opd_obd->obd_name, atomic_read(&d->opd_async_updates_count)); /* make sure the connection is fine */ lwi = LWI_TIMEOUT(cfs_time_seconds(obd_timeout), osp_sync_timeout, d); rc = l_wait_event(d->opd_sync_barrier_waitq, atomic_read(&d->opd_async_updates_count) == 0, &lwi); up_write(&d->opd_async_updates_rwsem); if (rc != 0) GOTO(out, rc); CDEBUG(D_CACHE, "%s: processed %llu\n", d->opd_obd->obd_name, (unsigned long long)atomic64_read(&d->opd_sync_processed_recs)); while (atomic64_read(&d->opd_sync_processed_recs) < old + recs) { __u64 last = atomic64_read(&d->opd_sync_processed_recs); /* make sure the connection is fine */ lwi = LWI_TIMEOUT(cfs_time_seconds(obd_timeout), osp_sync_timeout, d); l_wait_event(d->opd_sync_barrier_waitq, atomic64_read(&d->opd_sync_processed_recs) >= old + recs, &lwi); if (atomic64_read(&d->opd_sync_processed_recs) >= old + recs) break; if (atomic64_read(&d->opd_sync_processed_recs) != last) { /* some progress have been made, * keep trying... */ continue; } /* no changes and expired, something is wrong */ GOTO(out, rc = -ETIMEDOUT); } /* block new processing (barrier>0 - few callers are possible */ atomic_inc(&d->opd_sync_barrier); CDEBUG(D_CACHE, "%s: %u in flight\n", d->opd_obd->obd_name, atomic_read(&d->opd_sync_rpcs_in_flight)); /* wait till all-in-flight are replied, so executed by the target */ /* XXX: this is used by LFSCK at the moment, which doesn't require * all the changes to be committed, but in general it'd be * better to wait till commit */ while (atomic_read(&d->opd_sync_rpcs_in_flight) > 0) { old = atomic_read(&d->opd_sync_rpcs_in_flight); lwi = LWI_TIMEOUT(cfs_time_seconds(obd_timeout), osp_sync_timeout, d); l_wait_event(d->opd_sync_barrier_waitq, atomic_read(&d->opd_sync_rpcs_in_flight) == 0, &lwi); if (atomic_read(&d->opd_sync_rpcs_in_flight) == 0) break; if (atomic_read(&d->opd_sync_rpcs_in_flight) != old) { /* some progress have been made */ continue; } /* no changes and expired, something is wrong */ GOTO(out, rc = -ETIMEDOUT); } out: /* resume normal processing (barrier=0) */ atomic_dec(&d->opd_sync_barrier); osp_sync_check_for_work(d); CDEBUG(D_CACHE, "%s: done in %lld: rc = %d\n", d->opd_obd->obd_name, ktime_get_seconds() - start, rc); RETURN(rc); } const struct dt_device_operations osp_dt_ops = { .dt_statfs = osp_statfs, .dt_sync = osp_sync, .dt_trans_create = osp_trans_create, .dt_trans_start = osp_trans_start, .dt_trans_stop = osp_trans_stop, .dt_trans_cb_add = osp_trans_cb_add, }; /** * Connect OSP to local OSD. * * Locate the local OSD referenced by \a nextdev and connect to it. Sometimes, * OSP needs to access the local OSD to store some information. For example, * during precreate, it needs to update last used OID and sequence file * (LAST_SEQ) in local OSD. * * \param[in] env execution environment * \param[in] osp OSP device * \param[in] nextdev the name of local OSD * * \retval 0 0 connection succeeded * \retval negative negative errno connection failed */ static int osp_connect_to_osd(const struct lu_env *env, struct osp_device *osp, const char *nextdev) { struct obd_connect_data *data = NULL; struct obd_device *obd; int rc; ENTRY; LASSERT(osp->opd_storage_exp == NULL); OBD_ALLOC_PTR(data); if (data == NULL) RETURN(-ENOMEM); obd = class_name2obd(nextdev); if (obd == NULL) { CERROR("%s: can't locate next device: %s\n", osp->opd_obd->obd_name, nextdev); GOTO(out, rc = -ENOTCONN); } rc = obd_connect(env, &osp->opd_storage_exp, obd, &obd->obd_uuid, data, NULL); if (rc) { CERROR("%s: cannot connect to next dev %s: rc = %d\n", osp->opd_obd->obd_name, nextdev, rc); GOTO(out, rc); } osp->opd_dt_dev.dd_lu_dev.ld_site = osp->opd_storage_exp->exp_obd->obd_lu_dev->ld_site; LASSERT(osp->opd_dt_dev.dd_lu_dev.ld_site); osp->opd_storage = lu2dt_dev(osp->opd_storage_exp->exp_obd->obd_lu_dev); out: OBD_FREE_PTR(data); RETURN(rc); } /** * Determine if the lock needs to be cancelled * * Determine if the unused lock should be cancelled before replay, see * (ldlm_cancel_no_wait_policy()). Currently, only inode bits lock exists * between MDTs. * * \param[in] lock lock to be checked. * * \retval 1 if the lock needs to be cancelled before replay. * \retval 0 if the lock does not need to be cancelled before * replay. */ static int osp_cancel_weight(struct ldlm_lock *lock) { if (lock->l_resource->lr_type != LDLM_IBITS) RETURN(0); RETURN(1); } /** * Initialize OSP device according to the parameters in the configuration * log \a cfg. * * Reconstruct the local device name from the configuration profile, and * initialize necessary threads and structures according to the OSP type * (MDT or OST). * * Since there is no record in the MDT configuration for the local disk * device, we have to extract this from elsewhere in the profile. * The only information we get at setup is from the OSC records: * setup 0:{fsname}-OSTxxxx-osc[-MDTxxxx] 1:lustre-OST0000_UUID 2:NID * * Note: configs generated by Lustre 1.8 are missing the -MDTxxxx part, * so, we need to reconstruct the name of the underlying OSD from this: * {fsname}-{svname}-osd, for example "lustre-MDT0000-osd". * * \param[in] env execution environment * \param[in] osp OSP device * \param[in] ldt lu device type of OSP * \param[in] cfg configuration log * * \retval 0 0 if OSP initialization succeeded. * \retval negative negative errno if OSP initialization failed. */ static int osp_init0(const struct lu_env *env, struct osp_device *osp, struct lu_device_type *ldt, struct lustre_cfg *cfg) { struct obd_device *obd; struct obd_import *imp; char *src, *tgt, *mdt, *osdname = NULL; int rc; long idx; ENTRY; mutex_init(&osp->opd_async_requests_mutex); INIT_LIST_HEAD(&osp->opd_async_updates); init_rwsem(&osp->opd_async_updates_rwsem); atomic_set(&osp->opd_async_updates_count, 0); obd = class_name2obd(lustre_cfg_string(cfg, 0)); if (obd == NULL) { CERROR("Cannot find obd with name %s\n", lustre_cfg_string(cfg, 0)); RETURN(-ENODEV); } osp->opd_obd = obd; src = lustre_cfg_string(cfg, 0); if (src == NULL) RETURN(-EINVAL); tgt = strrchr(src, '-'); if (tgt == NULL) { CERROR("%s: invalid target name %s: rc = %d\n", osp->opd_obd->obd_name, lustre_cfg_string(cfg, 0), -EINVAL); RETURN(-EINVAL); } if (strncmp(tgt, "-osc", 4) == 0) { /* Old OSC name fsname-OSTXXXX-osc */ for (tgt--; tgt > src && *tgt != '-'; tgt--) ; if (tgt == src) { CERROR("%s: invalid target name %s: rc = %d\n", osp->opd_obd->obd_name, lustre_cfg_string(cfg, 0), -EINVAL); RETURN(-EINVAL); } if (strncmp(tgt, "-OST", 4) != 0) { CERROR("%s: invalid target name %s: rc = %d\n", osp->opd_obd->obd_name, lustre_cfg_string(cfg, 0), -EINVAL); RETURN(-EINVAL); } idx = simple_strtol(tgt + 4, &mdt, 16); if (mdt[0] != '-' || idx > INT_MAX || idx < 0) { CERROR("%s: invalid OST index in '%s': rc = %d\n", osp->opd_obd->obd_name, src, -EINVAL); RETURN(-EINVAL); } osp->opd_index = idx; osp->opd_group = 0; idx = tgt - src; } else { /* New OSC name fsname-OSTXXXX-osc-MDTXXXX */ if (strncmp(tgt, "-MDT", 4) != 0 && strncmp(tgt, "-OST", 4) != 0) { CERROR("%s: invalid target name %s: rc = %d\n", osp->opd_obd->obd_name, lustre_cfg_string(cfg, 0), -EINVAL); RETURN(-EINVAL); } idx = simple_strtol(tgt + 4, &mdt, 16); if (*mdt != '\0' || idx > INT_MAX || idx < 0) { CERROR("%s: invalid OST index in '%s': rc = %d\n", osp->opd_obd->obd_name, src, -EINVAL); RETURN(-EINVAL); } /* Get MDT index from the name and set it to opd_group, * which will be used by OSP to connect with OST */ osp->opd_group = idx; if (tgt - src <= 12) { CERROR("%s: invalid mdt index from %s: rc =%d\n", osp->opd_obd->obd_name, lustre_cfg_string(cfg, 0), -EINVAL); RETURN(-EINVAL); } if (strncmp(tgt - 12, "-MDT", 4) == 0) osp->opd_connect_mdt = 1; idx = simple_strtol(tgt - 8, &mdt, 16); if (mdt[0] != '-' || idx > INT_MAX || idx < 0) { CERROR("%s: invalid OST index in '%s': rc =%d\n", osp->opd_obd->obd_name, src, -EINVAL); RETURN(-EINVAL); } osp->opd_index = idx; idx = tgt - src - 12; } /* check the fsname length, and after this everything else will fit */ if (idx > MTI_NAME_MAXLEN) { CERROR("%s: fsname too long in '%s': rc = %d\n", osp->opd_obd->obd_name, src, -EINVAL); RETURN(-EINVAL); } OBD_ALLOC(osdname, MAX_OBD_NAME); if (osdname == NULL) RETURN(-ENOMEM); memcpy(osdname, src, idx); /* copy just the fsname part */ osdname[idx] = '\0'; mdt = strstr(mdt, "-MDT"); if (mdt == NULL) /* 1.8 configs don't have "-MDT0000" at the end */ strcat(osdname, "-MDT0000"); else strcat(osdname, mdt); strcat(osdname, "-osd"); CDEBUG(D_HA, "%s: connect to %s (%s)\n", obd->obd_name, osdname, src); osp_init_rpc_lock(osp); osp->opd_dt_dev.dd_lu_dev.ld_ops = &osp_lu_ops; osp->opd_dt_dev.dd_ops = &osp_dt_ops; obd->obd_lu_dev = &osp->opd_dt_dev.dd_lu_dev; rc = osp_connect_to_osd(env, osp, osdname); if (rc) GOTO(out_fini, rc); rc = ptlrpcd_addref(); if (rc) GOTO(out_disconnect, rc); rc = client_obd_setup(obd, cfg); if (rc) { CERROR("%s: can't setup obd: rc = %d\n", osp->opd_obd->obd_name, rc); GOTO(out_ref, rc); } osp_tunables_init(osp); rc = obd_fid_init(osp->opd_obd, NULL, osp->opd_connect_mdt ? LUSTRE_SEQ_METADATA : LUSTRE_SEQ_DATA); if (rc) { CERROR("%s: fid init error: rc = %d\n", osp->opd_obd->obd_name, rc); GOTO(out_proc, rc); } if (!osp->opd_connect_mdt) { /* Initialize last id from the storage - will be * used in orphan cleanup. */ if (!osp->opd_storage->dd_rdonly) { rc = osp_last_used_init(env, osp); if (rc) GOTO(out_fid, rc); } /* Initialize precreation thread, it handles new * connections as well. */ rc = osp_init_precreate(osp); if (rc) GOTO(out_last_used, rc); /* * Initialize synhronization mechanism taking * care of propogating changes to OST in near * transactional manner. */ rc = osp_sync_init(env, osp); if (rc < 0) GOTO(out_precreat, rc); } else { osp->opd_got_disconnected = 1; rc = osp_update_init(osp); if (rc != 0) GOTO(out_fid, rc); } rc = osp_init_statfs(osp); if (rc) GOTO(out_precreat, rc); ns_register_cancel(obd->obd_namespace, osp_cancel_weight); /* * Initiate connect to OST */ imp = obd->u.cli.cl_import; rc = ptlrpc_init_import(imp); if (rc) GOTO(out, rc); if (osdname) OBD_FREE(osdname, MAX_OBD_NAME); RETURN(0); out: if (!osp->opd_connect_mdt) /* stop sync thread */ osp_sync_fini(osp); out_precreat: /* stop precreate thread */ if (!osp->opd_connect_mdt) osp_precreate_fini(osp); else osp_update_fini(env, osp); out_last_used: if (!osp->opd_connect_mdt) osp_last_used_fini(env, osp); out_fid: obd_fid_fini(osp->opd_obd); out_proc: osp_tunables_fini(osp); client_obd_cleanup(obd); out_ref: ptlrpcd_decref(); out_disconnect: obd_disconnect(osp->opd_storage_exp); out_fini: if (osdname) OBD_FREE(osdname, MAX_OBD_NAME); RETURN(rc); } /** * Implementation of lu_device_type_operations::ldto_device_free * * Free the OSP device in memory. No return value is needed for now, * so always return NULL to comply with the interface. * * \param[in] env execution environment * \param[in] lu lu_device of OSP * * \retval NULL NULL unconditionally */ static struct lu_device *osp_device_free(const struct lu_env *env, struct lu_device *lu) { struct osp_device *osp = lu2osp_dev(lu); if (atomic_read(&lu->ld_ref) && lu->ld_site) { LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL); lu_site_print(env, lu->ld_site, &msgdata, lu_cdebug_printer); } dt_device_fini(&osp->opd_dt_dev); OBD_FREE_PTR(osp); return NULL; } /** * Implementation of lu_device_type_operations::ldto_device_alloc * * This function allocates and initializes OSP device in memory according to * the config log. * * \param[in] env execution environment * \param[in] type device type of OSP * \param[in] lcfg config log * * \retval pointer the pointer of allocated OSP if succeed. * \retval ERR_PTR(errno) ERR_PTR(errno) if failed. */ static struct lu_device *osp_device_alloc(const struct lu_env *env, struct lu_device_type *type, struct lustre_cfg *lcfg) { struct osp_device *osp; struct lu_device *ld; OBD_ALLOC_PTR(osp); if (osp == NULL) { ld = ERR_PTR(-ENOMEM); } else { int rc; ld = osp2lu_dev(osp); dt_device_init(&osp->opd_dt_dev, type); rc = osp_init0(env, osp, type, lcfg); if (rc != 0) { osp_device_free(env, ld); ld = ERR_PTR(rc); } } return ld; } /** * Implementation of lu_device_type_operations::ldto_device_fini * * This function cleans up the OSP device, i.e. release and free those * attached items in osp_device. * * \param[in] env execution environment * \param[in] ld lu_device of OSP * * \retval NULL NULL if cleanup succeeded. * \retval ERR_PTR(errno) ERR_PTR(errno) if cleanup failed. */ static struct lu_device *osp_device_fini(const struct lu_env *env, struct lu_device *ld) { struct osp_device *osp = lu2osp_dev(ld); int rc; ENTRY; if (osp->opd_async_requests != NULL) { osp_update_request_destroy(env, osp->opd_async_requests); osp->opd_async_requests = NULL; } if (osp->opd_storage_exp) { /* wait for the commit callbacks to complete */ wait_event(osp->opd_sync_waitq, atomic_read(&osp->opd_commits_registered) == 0); obd_disconnect(osp->opd_storage_exp); } LASSERT(osp->opd_obd); osp_tunables_fini(osp); rc = client_obd_cleanup(osp->opd_obd); if (rc != 0) { ptlrpcd_decref(); RETURN(ERR_PTR(rc)); } ptlrpcd_decref(); RETURN(NULL); } /** * Implementation of obd_ops::o_reconnect * * This function is empty and does not need to do anything for now. */ static int osp_reconnect(const struct lu_env *env, struct obd_export *exp, struct obd_device *obd, struct obd_uuid *cluuid, struct obd_connect_data *data, void *localdata) { return 0; } /* * Implementation of obd_ops::o_connect * * Connect OSP to the remote target (MDT or OST). Allocate the * export and return it to the LOD, which calls this function * for each OSP to connect it to the remote target. This function * is currently only called once per OSP. * * \param[in] env execution environment * \param[out] exp export connected to OSP * \param[in] obd OSP device * \param[in] cluuid OSP device client uuid * \param[in] data connect_data to be used to connect to the remote * target * \param[in] localdata necessary for the API interface, but not used in * this function * * \retval 0 0 if the connection succeeded. * \retval negative negative errno if the connection failed. */ static int osp_obd_connect(const struct lu_env *env, struct obd_export **exp, struct obd_device *obd, struct obd_uuid *cluuid, struct obd_connect_data *data, void *localdata) { struct osp_device *osp = lu2osp_dev(obd->obd_lu_dev); struct obd_connect_data *ocd; struct obd_import *imp; struct lustre_handle conn; int rc; ENTRY; CDEBUG(D_CONFIG, "connect #%d\n", osp->opd_connects); rc = class_connect(&conn, obd, cluuid); if (rc) RETURN(rc); *exp = class_conn2export(&conn); /* Why should there ever be more than 1 connect? */ osp->opd_connects++; LASSERT(osp->opd_connects == 1); osp->opd_exp = *exp; imp = osp->opd_obd->u.cli.cl_import; imp->imp_dlm_handle = conn; LASSERT(data != NULL); LASSERT(data->ocd_connect_flags & OBD_CONNECT_INDEX); ocd = &imp->imp_connect_data; *ocd = *data; imp->imp_connect_flags_orig = ocd->ocd_connect_flags; imp->imp_connect_flags2_orig = ocd->ocd_connect_flags2; ocd->ocd_version = LUSTRE_VERSION_CODE; ocd->ocd_index = data->ocd_index; rc = ptlrpc_connect_import(imp); if (rc) { CERROR("%s: can't connect obd: rc = %d\n", obd->obd_name, rc); GOTO(out, rc); } else { osp->opd_obd->u.cli.cl_seq->lcs_exp = class_export_get(osp->opd_exp); } ptlrpc_pinger_add_import(imp); out: RETURN(rc); } /** * Implementation of obd_ops::o_disconnect * * Disconnect the export for the OSP. This is called by LOD to release the * OSP during cleanup (\see lod_del_device()). The OSP will be released after * the export is released. * * \param[in] exp export to be disconnected. * * \retval 0 0 if disconnection succeed * \retval negative negative errno if disconnection failed */ static int osp_obd_disconnect(struct obd_export *exp) { struct obd_device *obd = exp->exp_obd; struct osp_device *osp = lu2osp_dev(obd->obd_lu_dev); int rc; ENTRY; /* Only disconnect the underlying layers on the final disconnect. */ LASSERT(osp->opd_connects == 1); osp->opd_connects--; rc = class_disconnect(exp); if (rc) { CERROR("%s: class disconnect error: rc = %d\n", obd->obd_name, rc); RETURN(rc); } /* destroy the device */ class_manual_cleanup(obd); RETURN(rc); } /** * Implementation of obd_ops::o_statfs * * Send a RPC to the remote target to get statfs status. This is only used * in lprocfs helpers by obd_statfs. * * \param[in] env execution environment * \param[in] exp connection state from this OSP to the parent (LOD) * device * \param[out] osfs hold the statfs result * \param[in] unused Not used in this function for now * \param[in] flags flags to indicate how OSP will issue the RPC * * \retval 0 0 if statfs succeeded. * \retval negative negative errno if statfs failed. */ static int osp_obd_statfs(const struct lu_env *env, struct obd_export *exp, struct obd_statfs *osfs, time64_t unused, __u32 flags) { struct obd_statfs *msfs; struct ptlrpc_request *req; struct obd_import *imp = NULL; int rc; ENTRY; /* Since the request might also come from lprocfs, so we need * sync this with client_disconnect_export Bug15684 */ down_read(&exp->exp_obd->u.cli.cl_sem); if (exp->exp_obd->u.cli.cl_import) imp = class_import_get(exp->exp_obd->u.cli.cl_import); up_read(&exp->exp_obd->u.cli.cl_sem); if (!imp) RETURN(-ENODEV); req = ptlrpc_request_alloc(imp, &RQF_OST_STATFS); class_import_put(imp); if (req == NULL) RETURN(-ENOMEM); rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_STATFS); if (rc) { ptlrpc_request_free(req); RETURN(rc); } ptlrpc_request_set_replen(req); req->rq_request_portal = OST_CREATE_PORTAL; ptlrpc_at_set_req_timeout(req); if (flags & OBD_STATFS_NODELAY) { /* procfs requests not want stat in wait for avoid deadlock */ req->rq_no_resend = 1; req->rq_no_delay = 1; } rc = ptlrpc_queue_wait(req); if (rc) GOTO(out, rc); msfs = req_capsule_server_get(&req->rq_pill, &RMF_OBD_STATFS); if (msfs == NULL) GOTO(out, rc = -EPROTO); *osfs = *msfs; EXIT; out: ptlrpc_req_finished(req); return rc; } /** * Implementation of obd_ops::o_import_event * * This function is called when some related import event happens. It will * mark the necessary flags according to the event and notify the necessary * threads (mainly precreate thread). * * \param[in] obd OSP OBD device * \param[in] imp import attached from OSP to remote (OST/MDT) service * \param[in] event event related to remote service (IMP_EVENT_*) * * \retval 0 0 if the event handling succeeded. * \retval negative negative errno if the event handling failed. */ static int osp_import_event(struct obd_device *obd, struct obd_import *imp, enum obd_import_event event) { struct osp_device *d = lu2osp_dev(obd->obd_lu_dev); int rc; switch (event) { case IMP_EVENT_DISCON: d->opd_got_disconnected = 1; d->opd_imp_connected = 0; if (d->opd_connect_mdt) break; if (d->opd_pre != NULL) { osp_pre_update_status(d, -ENODEV); wake_up(&d->opd_pre_waitq); } CDEBUG(D_HA, "got disconnected\n"); break; case IMP_EVENT_INACTIVE: d->opd_imp_active = 0; d->opd_imp_connected = 0; d->opd_obd->obd_inactive = 1; if (d->opd_connect_mdt) break; if (d->opd_pre != NULL) { /* Import is invalid, we can`t get stripes so * wakeup waiters */ rc = imp->imp_deactive ? -ESHUTDOWN : -ENODEV; osp_pre_update_status(d, rc); wake_up(&d->opd_pre_waitq); } CDEBUG(D_HA, "got inactive\n"); break; case IMP_EVENT_ACTIVE: d->opd_imp_active = 1; if (d->opd_got_disconnected) d->opd_new_connection = 1; d->opd_imp_connected = 1; d->opd_imp_seen_connected = 1; d->opd_obd->obd_inactive = 0; wake_up(&d->opd_pre_waitq); if (d->opd_connect_mdt) break; osp_sync_check_for_work(d); CDEBUG(D_HA, "got connected\n"); break; case IMP_EVENT_INVALIDATE: if (d->opd_connect_mdt) osp_invalidate_request(d); if (obd->obd_namespace == NULL) break; ldlm_namespace_cleanup(obd->obd_namespace, LDLM_FL_LOCAL_ONLY); break; case IMP_EVENT_OCD: case IMP_EVENT_DEACTIVATE: case IMP_EVENT_ACTIVATE: break; default: CERROR("%s: unsupported import event: %#x\n", obd->obd_name, event); } return 0; } /** * Implementation of obd_ops: o_iocontrol * * This function is the ioctl handler for OSP. Note: lctl will access the OSP * directly by ioctl, instead of through the MDS stack. * * param[in] cmd ioctl command. * param[in] exp export of this OSP. * param[in] len data length of \a karg. * param[in] karg input argument which is packed as * obd_ioctl_data * param[out] uarg pointer to userspace buffer (must access by * copy_to_user()). * * \retval 0 0 if the ioctl handling succeeded. * \retval negative negative errno if the ioctl handling failed. */ static int osp_iocontrol(unsigned int cmd, struct obd_export *exp, int len, void *karg, void __user *uarg) { struct obd_device *obd = exp->exp_obd; struct osp_device *d; struct obd_ioctl_data *data = karg; int rc = 0; ENTRY; LASSERT(obd->obd_lu_dev); d = lu2osp_dev(obd->obd_lu_dev); LASSERT(d->opd_dt_dev.dd_ops == &osp_dt_ops); if (!try_module_get(THIS_MODULE)) { CERROR("%s: cannot get module '%s'\n", obd->obd_name, module_name(THIS_MODULE)); return -EINVAL; } switch (cmd) { case OBD_IOC_CLIENT_RECOVER: rc = ptlrpc_recover_import(obd->u.cli.cl_import, data->ioc_inlbuf1, 0); if (rc > 0) rc = 0; break; case IOC_OSC_SET_ACTIVE: rc = ptlrpc_set_import_active(obd->u.cli.cl_import, data->ioc_offset); break; default: CERROR("%s: unrecognized ioctl %#x by %s\n", obd->obd_name, cmd, current_comm()); rc = -ENOTTY; } module_put(THIS_MODULE); return rc; } /** * Implementation of obd_ops::o_get_info * * Retrieve information by key. Retrieval starts from the top layer * (MDT) of the MDS stack and traverses the stack by calling the * obd_get_info() method of the next sub-layer. * * \param[in] env execution environment * \param[in] exp export of this OSP * \param[in] keylen length of \a key * \param[in] key the key * \param[out] vallen length of \a val * \param[out] val holds the value returned by the key * * \retval 0 0 if getting information succeeded. * \retval negative negative errno if getting information failed. */ static int osp_obd_get_info(const struct lu_env *env, struct obd_export *exp, __u32 keylen, void *key, __u32 *vallen, void *val) { int rc = -EINVAL; if (KEY_IS(KEY_OSP_CONNECTED)) { struct obd_device *obd = exp->exp_obd; struct osp_device *osp; if (!obd->obd_set_up || obd->obd_stopping) RETURN(-EAGAIN); osp = lu2osp_dev(obd->obd_lu_dev); LASSERT(osp); /* * 1.8/2.0 behaviour is that OST being connected once at least * is considered "healthy". and one "healthy" OST is enough to * allow lustre clients to connect to MDS */ RETURN(!osp->opd_imp_seen_connected); } RETURN(rc); } static int osp_obd_set_info_async(const struct lu_env *env, struct obd_export *exp, u32 keylen, void *key, u32 vallen, void *val, struct ptlrpc_request_set *set) { struct obd_device *obd = exp->exp_obd; struct obd_import *imp = obd->u.cli.cl_import; struct osp_device *osp; struct ptlrpc_request *req; char *tmp; int rc; if (KEY_IS(KEY_SPTLRPC_CONF)) { sptlrpc_conf_client_adapt(exp->exp_obd); RETURN(0); } LASSERT(set != NULL); if (!obd->obd_set_up || obd->obd_stopping) RETURN(-EAGAIN); osp = lu2osp_dev(obd->obd_lu_dev); req = ptlrpc_request_alloc(imp, &RQF_OBD_SET_INFO); if (req == NULL) RETURN(-ENOMEM); req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_KEY, RCL_CLIENT, keylen); req_capsule_set_size(&req->rq_pill, &RMF_SETINFO_VAL, RCL_CLIENT, vallen); if (osp->opd_connect_mdt) rc = ptlrpc_request_pack(req, LUSTRE_MDS_VERSION, MDS_SET_INFO); else rc = ptlrpc_request_pack(req, LUSTRE_OST_VERSION, OST_SET_INFO); if (rc) { ptlrpc_request_free(req); RETURN(rc); } tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_KEY); memcpy(tmp, key, keylen); tmp = req_capsule_client_get(&req->rq_pill, &RMF_SETINFO_VAL); memcpy(tmp, val, vallen); ptlrpc_request_set_replen(req); ptlrpc_set_add_req(set, req); ptlrpc_check_set(NULL, set); RETURN(0); } /** * Implementation of obd_ops: o_fid_alloc * * Allocate a FID. There are two cases in which OSP performs * FID allocation. * * 1. FID precreation for data objects, which is done in * osp_precreate_fids() instead of this function. * 2. FID allocation for each sub-stripe of a striped directory. * Similar to other FID clients, OSP requests the sequence * from its corresponding remote MDT, which in turn requests * sequences from the sequence controller (MDT0). * * \param[in] env execution environment * \param[in] exp export of the OSP * \param[out] fid FID being allocated * \param[in] unused necessary for the interface but unused. * * \retval 0 0 FID allocated successfully. * \retval 1 1 FID allocated successfully and new sequence * requested from seq meta server * \retval negative negative errno if FID allocation failed. */ static int osp_fid_alloc(const struct lu_env *env, struct obd_export *exp, struct lu_fid *fid, struct md_op_data *unused) { struct client_obd *cli = &exp->exp_obd->u.cli; struct osp_device *osp = lu2osp_dev(exp->exp_obd->obd_lu_dev); struct lu_client_seq *seq = cli->cl_seq; ENTRY; LASSERT(osp->opd_obd->u.cli.cl_seq != NULL); /* Sigh, fid client is not ready yet */ LASSERT(osp->opd_obd->u.cli.cl_seq->lcs_exp != NULL); RETURN(seq_client_alloc_fid(env, seq, fid)); } /* context key constructor/destructor: mdt_key_init, mdt_key_fini */ LU_KEY_INIT_FINI(osp, struct osp_thread_info); static void osp_key_exit(const struct lu_context *ctx, struct lu_context_key *key, void *data) { struct osp_thread_info *info = data; info->osi_attr.la_valid = 0; } struct lu_context_key osp_thread_key = { .lct_tags = LCT_MD_THREAD, .lct_init = osp_key_init, .lct_fini = osp_key_fini, .lct_exit = osp_key_exit }; /* context key constructor/destructor: mdt_txn_key_init, mdt_txn_key_fini */ LU_KEY_INIT_FINI(osp_txn, struct osp_txn_info); struct lu_context_key osp_txn_key = { .lct_tags = LCT_OSP_THREAD, .lct_init = osp_txn_key_init, .lct_fini = osp_txn_key_fini }; LU_TYPE_INIT_FINI(osp, &osp_thread_key, &osp_txn_key); static struct lu_device_type_operations osp_device_type_ops = { .ldto_init = osp_type_init, .ldto_fini = osp_type_fini, .ldto_start = osp_type_start, .ldto_stop = osp_type_stop, .ldto_device_alloc = osp_device_alloc, .ldto_device_free = osp_device_free, .ldto_device_fini = osp_device_fini }; static struct lu_device_type osp_device_type = { .ldt_tags = LU_DEVICE_DT, .ldt_name = LUSTRE_OSP_NAME, .ldt_ops = &osp_device_type_ops, .ldt_ctx_tags = LCT_MD_THREAD | LCT_DT_THREAD, }; static struct obd_ops osp_obd_device_ops = { .o_owner = THIS_MODULE, .o_add_conn = client_import_add_conn, .o_del_conn = client_import_del_conn, .o_reconnect = osp_reconnect, .o_connect = osp_obd_connect, .o_disconnect = osp_obd_disconnect, .o_get_info = osp_obd_get_info, .o_set_info_async = osp_obd_set_info_async, .o_import_event = osp_import_event, .o_iocontrol = osp_iocontrol, .o_statfs = osp_obd_statfs, .o_fid_init = client_fid_init, .o_fid_fini = client_fid_fini, .o_fid_alloc = osp_fid_alloc, }; static struct obd_type *sym; /** * Initialize OSP module. * * Register device types OSP and Light Weight Proxy (LWP) (\see lwp_dev.c) * in obd_types (\see class_obd.c). Initialize procfs for the * the OSP device. Note: OSP was called OSC before Lustre 2.4, * so for compatibility it still uses the name "osc" in procfs. * This is called at module load time. * * \retval 0 0 if initialization succeeds. * \retval negative negative errno if initialization failed. */ static int __init osp_init(void) { struct dentry *symlink; struct obd_type *type; struct qstr dname; int rc; rc = lu_kmem_init(osp_caches); if (rc) return rc; rc = class_register_type(&osp_obd_device_ops, NULL, true, NULL, LUSTRE_OSP_NAME, &osp_device_type); if (rc != 0) { lu_kmem_fini(osp_caches); return rc; } rc = class_register_type(&lwp_obd_device_ops, NULL, false, NULL, LUSTRE_LWP_NAME, &lwp_device_type); if (rc != 0) { class_unregister_type(LUSTRE_OSP_NAME); lu_kmem_fini(osp_caches); return rc; } sym = class_setup_tunables(LUSTRE_OSC_NAME); if (IS_ERR(sym)) { rc = PTR_ERR(sym); /* does real "osc" already exist ? */ if (rc == -EEXIST) GOTO(try_proc, rc = 0); GOTO(no_osc, rc); } /* create "osc" entry for compatibility purposes */ dname.name = "osc"; dname.len = strlen(dname.name); dname.hash = ll_full_name_hash(debugfs_lustre_root, dname.name, dname.len); symlink = d_lookup(debugfs_lustre_root, &dname); if (!symlink) { symlink = debugfs_create_dir(dname.name, debugfs_lustre_root); if (IS_ERR_OR_NULL(symlink)) { rc = symlink ? PTR_ERR(symlink) : -ENOMEM; GOTO(no_osc, rc); } sym->typ_debugfs_entry = symlink; } else { dput(symlink); } try_proc: type = class_search_type(LUSTRE_OSC_NAME); if (type != NULL && type->typ_procroot != NULL) GOTO(no_osc, rc); type = class_search_type(LUSTRE_OSP_NAME); type->typ_procsym = lprocfs_register("osc", proc_lustre_root, NULL, NULL); if (IS_ERR(type->typ_procsym)) { CERROR("osp: can't create compat entry \"osc\": %d\n", (int) PTR_ERR(type->typ_procsym)); type->typ_procsym = NULL; } no_osc: return rc; } /** * Finalize OSP module. * * This callback is called when kernel unloads OSP module from memory, and * it will deregister OSP and LWP device type from obd_types (\see class_obd.c). */ static void __exit osp_exit(void) { if (!IS_ERR_OR_NULL(sym)) { ldebugfs_remove(&sym->typ_debugfs_entry); kobject_put(&sym->typ_kobj); } class_unregister_type(LUSTRE_LWP_NAME); class_unregister_type(LUSTRE_OSP_NAME); lu_kmem_fini(osp_caches); } MODULE_AUTHOR("OpenSFS, Inc. "); MODULE_DESCRIPTION("Lustre OSD Storage Proxy ("LUSTRE_OSP_NAME")"); MODULE_VERSION(LUSTRE_VERSION_STRING); MODULE_LICENSE("GPL"); module_init(osp_init); module_exit(osp_exit);