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13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
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27 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2012, 2014, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/osd-zfs/osd_handler.c
37 * Top-level entry points into osd module
39 * Author: Alex Zhuravlev <bzzz@whamcloud.com>
40 * Author: Mike Pershin <tappro@whamcloud.com>
41 * Author: Johann Lombardi <johann@whamcloud.com>
44 #define DEBUG_SUBSYSTEM S_OSD
46 #include <lustre_ver.h>
47 #include <libcfs/libcfs.h>
48 #include <obd_support.h>
49 #include <lustre_net.h>
51 #include <obd_class.h>
52 #include <lustre_disk.h>
53 #include <lustre_fid.h>
54 #include <lustre_param.h>
55 #include <md_object.h>
57 #include "osd_internal.h"
59 #include <sys/dnode.h>
64 #include <sys/spa_impl.h>
65 #include <sys/zfs_znode.h>
66 #include <sys/dmu_tx.h>
67 #include <sys/dmu_objset.h>
68 #include <sys/dsl_prop.h>
69 #include <sys/sa_impl.h>
72 struct lu_context_key osd_key;
74 /* Slab for OSD object allocation */
75 struct kmem_cache *osd_object_kmem;
77 /* Slab to allocate osd_zap_it */
78 struct kmem_cache *osd_zapit_cachep;
80 static struct lu_kmem_descr osd_caches[] = {
82 .ckd_cache = &osd_object_kmem,
83 .ckd_name = "zfs_osd_obj",
84 .ckd_size = sizeof(struct osd_object)
87 .ckd_cache = &osd_zapit_cachep,
88 .ckd_name = "osd_zapit_cache",
89 .ckd_size = sizeof(struct osd_zap_it)
96 static void arc_prune_func(int64_t bytes, void *private)
98 struct osd_device *od = private;
99 struct lu_site *site = &od->od_site;
103 rc = lu_env_init(&env, LCT_SHRINKER);
105 CERROR("%s: can't initialize shrinker env: rc = %d\n",
110 lu_site_purge(&env, site, (bytes >> 10));
116 * Concurrency: doesn't access mutable data
118 static int osd_root_get(const struct lu_env *env,
119 struct dt_device *dev, struct lu_fid *f)
121 lu_local_obj_fid(f, OSD_FS_ROOT_OID);
126 * OSD object methods.
130 * Concurrency: shouldn't matter.
132 static void osd_trans_commit_cb(void *cb_data, int error)
134 struct osd_thandle *oh = cb_data;
135 struct thandle *th = &oh->ot_super;
136 struct osd_device *osd = osd_dt_dev(th->th_dev);
137 struct lu_device *lud = &th->th_dev->dd_lu_dev;
138 struct dt_txn_commit_cb *dcb, *tmp;
143 if (error == ECANCELED)
144 CWARN("%s: transaction @0x%p was aborted\n",
145 osd_dt_dev(th->th_dev)->od_svname, th);
147 CERROR("%s: transaction @0x%p commit error: rc = %d\n",
148 osd_dt_dev(th->th_dev)->od_svname, th, error);
151 dt_txn_hook_commit(th);
153 /* call per-transaction callbacks if any */
154 list_for_each_entry_safe(dcb, tmp, &oh->ot_dcb_list, dcb_linkage)
155 dcb->dcb_func(NULL, th, dcb, error);
157 /* Unlike ldiskfs, zfs updates space accounting at commit time.
158 * As a consequence, op_end is called only now to inform the quota slave
159 * component that reserved quota space is now accounted in usage and
160 * should be released. Quota space won't be adjusted at this point since
161 * we can't provide a suitable environment. It will be performed
162 * asynchronously by a lquota thread. */
163 qsd_op_end(NULL, osd->od_quota_slave, &oh->ot_quota_trans);
167 lu_context_exit(&th->th_ctx);
168 lu_context_fini(&th->th_ctx);
174 static int osd_trans_cb_add(struct thandle *th, struct dt_txn_commit_cb *dcb)
176 struct osd_thandle *oh;
178 oh = container_of0(th, struct osd_thandle, ot_super);
179 list_add(&dcb->dcb_linkage, &oh->ot_dcb_list);
185 * Concurrency: shouldn't matter.
187 static int osd_trans_start(const struct lu_env *env, struct dt_device *d,
190 struct osd_thandle *oh;
194 oh = container_of0(th, struct osd_thandle, ot_super);
198 rc = dt_txn_hook_start(env, d, th);
202 if (oh->ot_write_commit && OBD_FAIL_CHECK(OBD_FAIL_OST_MAPBLK_ENOSPC))
203 /* Unlike ldiskfs, ZFS checks for available space and returns
204 * -ENOSPC when assigning txg */
207 rc = -dmu_tx_assign(oh->ot_tx, TXG_WAIT);
208 if (unlikely(rc != 0)) {
209 struct osd_device *osd = osd_dt_dev(d);
210 /* dmu will call commit callback with error code during abort */
211 if (!lu_device_is_md(&d->dd_lu_dev) && rc == -ENOSPC)
212 CERROR("%s: failed to start transaction due to ENOSPC. "
213 "Metadata overhead is underestimated or "
214 "grant_ratio is too low.\n", osd->od_svname);
216 CERROR("%s: can't assign tx: rc = %d\n",
219 /* add commit callback */
220 dmu_tx_callback_register(oh->ot_tx, osd_trans_commit_cb, oh);
222 lu_context_init(&th->th_ctx, th->th_tags);
223 lu_context_enter(&th->th_ctx);
224 lu_device_get(&d->dd_lu_dev);
230 static int osd_unlinked_object_free(struct osd_device *osd, uint64_t oid);
232 static void osd_unlinked_list_emptify(struct osd_device *osd,
233 struct list_head *list, bool free)
235 struct osd_object *obj;
238 while (!list_empty(list)) {
239 obj = list_entry(list->next,
240 struct osd_object, oo_unlinked_linkage);
241 LASSERT(obj->oo_db != NULL);
242 oid = obj->oo_db->db_object;
244 list_del_init(&obj->oo_unlinked_linkage);
246 (void)osd_unlinked_object_free(osd, oid);
251 * Concurrency: shouldn't matter.
253 static int osd_trans_stop(const struct lu_env *env, struct dt_device *dt,
256 struct osd_device *osd = osd_dt_dev(th->th_dev);
257 bool sync = (th->th_sync != 0);
258 struct osd_thandle *oh;
259 struct list_head unlinked;
264 oh = container_of0(th, struct osd_thandle, ot_super);
265 INIT_LIST_HEAD(&unlinked);
266 list_splice_init(&oh->ot_unlinked_list, &unlinked);
268 if (oh->ot_assigned == 0) {
270 dmu_tx_abort(oh->ot_tx);
271 osd_object_sa_dirty_rele(oh);
272 osd_unlinked_list_emptify(osd, &unlinked, false);
273 /* there won't be any commit, release reserved quota space now,
275 qsd_op_end(env, osd->od_quota_slave, &oh->ot_quota_trans);
280 /* When doing our own inode accounting, the ZAPs storing per-uid/gid
281 * usage are updated at operation execution time, so we should call
282 * qsd_op_end() straight away. Otherwise (for blk accounting maintained
283 * by ZFS and when #inode is estimated from #blks) accounting is updated
284 * at commit time and the call to qsd_op_end() must be delayed */
285 if (oh->ot_quota_trans.lqt_id_cnt > 0 &&
286 !oh->ot_quota_trans.lqt_ids[0].lqi_is_blk &&
287 !osd->od_quota_iused_est)
288 qsd_op_end(env, osd->od_quota_slave, &oh->ot_quota_trans);
290 rc = dt_txn_hook_stop(env, th);
292 CDEBUG(D_OTHER, "%s: transaction hook failed: rc = %d\n",
296 txg = oh->ot_tx->tx_txg;
298 osd_object_sa_dirty_rele(oh);
299 /* XXX: Once dmu_tx_commit() called, oh/th could have been freed
300 * by osd_trans_commit_cb already. */
301 dmu_tx_commit(oh->ot_tx);
303 osd_unlinked_list_emptify(osd, &unlinked, true);
306 txg_wait_synced(dmu_objset_pool(osd->od_os), txg);
311 static struct thandle *osd_trans_create(const struct lu_env *env,
312 struct dt_device *dt)
314 struct osd_device *osd = osd_dt_dev(dt);
315 struct osd_thandle *oh;
320 tx = dmu_tx_create(osd->od_os);
322 RETURN(ERR_PTR(-ENOMEM));
324 /* alloc callback data */
328 RETURN(ERR_PTR(-ENOMEM));
332 INIT_LIST_HEAD(&oh->ot_dcb_list);
333 INIT_LIST_HEAD(&oh->ot_unlinked_list);
334 INIT_LIST_HEAD(&oh->ot_sa_list);
335 sema_init(&oh->ot_sa_lock, 1);
336 memset(&oh->ot_quota_trans, 0, sizeof(oh->ot_quota_trans));
340 th->th_tags = LCT_TX_HANDLE;
344 /* Estimate the number of objects from a number of blocks */
345 uint64_t osd_objs_count_estimate(uint64_t refdbytes, uint64_t usedobjs,
346 uint64_t nrblocks, uint64_t est_maxblockshift)
348 uint64_t est_objs, est_refdblocks, est_usedobjs;
350 /* Compute an nrblocks estimate based on the actual number of
351 * dnodes that could fit in the space. Since we don't know the
352 * overhead associated with each dnode (xattrs, SAs, VDEV overhead,
353 * etc) just using DNODE_SHIFT isn't going to give a good estimate.
354 * Instead, compute an estimate based on the average space usage per
355 * dnode, with an upper and lower cap.
357 * In case there aren't many dnodes or blocks used yet, add a small
358 * correction factor using OSD_DNODE_EST_SHIFT. This correction
359 * factor gradually disappears as the number of real dnodes grows.
360 * This also avoids the need to check for divide-by-zero later.
362 CLASSERT(OSD_DNODE_MIN_BLKSHIFT > 0);
363 CLASSERT(OSD_DNODE_EST_BLKSHIFT > 0);
365 est_refdblocks = (refdbytes >> est_maxblockshift) +
366 (OSD_DNODE_EST_COUNT >> OSD_DNODE_EST_BLKSHIFT);
367 est_usedobjs = usedobjs + OSD_DNODE_EST_COUNT;
369 /* Average space/dnode more than maximum dnode size, use max dnode
370 * size to estimate free dnodes from adjusted free blocks count.
371 * OSTs typically use more than one block dnode so this case applies. */
372 if (est_usedobjs <= est_refdblocks * 2) {
375 /* Average space/dnode smaller than min dnode size (probably due to
376 * metadnode compression), use min dnode size to estimate the number of
378 * An MDT typically uses below 512 bytes/dnode so this case applies. */
379 } else if (est_usedobjs >= (est_refdblocks << OSD_DNODE_MIN_BLKSHIFT)) {
380 est_objs = nrblocks << OSD_DNODE_MIN_BLKSHIFT;
382 /* Between the extremes, we try to use the average size of
383 * existing dnodes to compute the number of dnodes that fit
386 * est_objs = nrblocks * (est_usedobjs / est_refblocks);
388 * but this may overflow 64 bits or become 0 if not handled well
390 * We know nrblocks is below (64 - 17 = 47) bits from
391 * SPA_MAXBLKSHIFT, and est_usedobjs is under 48 bits due to
392 * DN_MAX_OBJECT_SHIFT, which means that multiplying them may
393 * get as large as 2 ^ 95.
395 * We also know (est_usedobjs / est_refdblocks) is between 2 and
396 * 256, due to above checks, we can safely compute this first.
397 * We care more about accuracy on the MDT (many dnodes/block)
398 * which is good because this is where truncation errors are
399 * smallest. This adds 8 bits to nrblocks so we can use 7 bits
400 * to compute a fixed-point fraction and nrblocks can still fit
403 unsigned dnodes_per_block = (est_usedobjs << 7)/est_refdblocks;
405 est_objs = (nrblocks * dnodes_per_block) >> 7;
410 static int osd_objset_statfs(struct osd_device *osd, struct obd_statfs *osfs)
412 struct objset *os = osd->od_os;
413 uint64_t refdbytes, availbytes, usedobjs, availobjs;
414 uint64_t est_availobjs;
418 dmu_objset_space(os, &refdbytes, &availbytes, &usedobjs, &availobjs);
421 * ZFS allows multiple block sizes. For statfs, Linux makes no
422 * proper distinction between bsize and frsize. For calculations
423 * of free and used blocks incorrectly uses bsize instead of frsize,
424 * but bsize is also used as the optimal blocksize. We return the
425 * largest possible block size as IO size for the optimum performance
426 * and scale the free and used blocks count appropriately.
428 osfs->os_bsize = osd->od_max_blksz;
429 bshift = fls64(osfs->os_bsize) - 1;
431 osfs->os_blocks = (refdbytes + availbytes) >> bshift;
432 osfs->os_bfree = availbytes >> bshift;
433 osfs->os_bavail = osfs->os_bfree; /* no extra root reservation */
435 /* Take replication (i.e. number of copies) into account */
436 osfs->os_bavail /= os->os_copies;
439 * Reserve some space so we don't run into ENOSPC due to grants not
440 * accounting for metadata overhead in ZFS, and to avoid fragmentation.
441 * Rather than report this via os_bavail (which makes users unhappy if
442 * they can't fill the filesystem 100%), reduce os_blocks as well.
444 * Reserve 0.78% of total space, at least 4MB for small filesystems,
445 * for internal files to be created/unlinked when space is tight.
447 CLASSERT(OSD_STATFS_RESERVED_SIZE > 0);
448 if (likely(osfs->os_blocks >= OSD_STATFS_RESERVED_SIZE))
449 reserved = osfs->os_blocks >> OSD_STATFS_RESERVED_SHIFT;
451 reserved = OSD_STATFS_RESERVED_SIZE >> bshift;
453 osfs->os_blocks -= reserved;
454 osfs->os_bfree -= MIN(reserved, osfs->os_bfree);
455 osfs->os_bavail -= MIN(reserved, osfs->os_bavail);
458 * The availobjs value returned from dmu_objset_space() is largely
459 * useless, since it reports the number of objects that might
460 * theoretically still fit into the dataset, independent of minor
461 * issues like how much space is actually available in the pool.
462 * Compute a better estimate in udmu_objs_count_estimate().
464 est_availobjs = osd_objs_count_estimate(refdbytes, usedobjs,
465 osfs->os_bfree, bshift);
467 osfs->os_ffree = min(availobjs, est_availobjs);
468 osfs->os_files = osfs->os_ffree + usedobjs;
470 /* ZFS XXX: fill in backing dataset FSID/UUID
471 memcpy(osfs->os_fsid, .... );*/
473 /* We're a zfs filesystem. */
474 osfs->os_type = UBERBLOCK_MAGIC;
476 /* ZFS XXX: fill in appropriate OS_STATE_{DEGRADED,READONLY} flags
477 osfs->os_state = vf_to_stf(vfsp->vfs_flag);
478 if (sb->s_flags & MS_RDONLY)
479 osfs->os_state = OS_STATE_READONLY;
482 osfs->os_namelen = MAXNAMELEN;
483 osfs->os_maxbytes = OBD_OBJECT_EOF;
489 * Concurrency: shouldn't matter.
491 int osd_statfs(const struct lu_env *env, struct dt_device *d,
492 struct obd_statfs *osfs)
497 rc = osd_objset_statfs(osd_dt_dev(d), osfs);
498 if (unlikely(rc != 0))
501 osfs->os_bavail -= min_t(u64,
502 OSD_GRANT_FOR_LOCAL_OIDS / osfs->os_bsize,
507 static int osd_blk_insert_cost(struct osd_device *osd)
509 int max_blockshift, nr_blkptrshift, bshift;
511 /* max_blockshift is the log2 of the number of blocks needed to reach
512 * the maximum filesize (that's to say 2^64) */
513 bshift = osd_spa_maxblockshift(dmu_objset_spa(osd->od_os));
514 max_blockshift = DN_MAX_OFFSET_SHIFT - bshift;
516 /* nr_blkptrshift is the log2 of the number of block pointers that can
517 * be stored in an indirect block */
518 CLASSERT(DN_MAX_INDBLKSHIFT > SPA_BLKPTRSHIFT);
519 nr_blkptrshift = DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT;
521 /* max_blockshift / nr_blkptrshift is thus the maximum depth of the
522 * tree. We add +1 for rounding purpose.
523 * The tree depth times the indirect block size gives us the maximum
524 * cost of inserting a block in the tree */
525 return (max_blockshift / nr_blkptrshift + 1) * (1<<DN_MAX_INDBLKSHIFT);
529 * Concurrency: doesn't access mutable data.
531 static void osd_conf_get(const struct lu_env *env,
532 const struct dt_device *dev,
533 struct dt_device_param *param)
535 struct osd_device *osd = osd_dt_dev(dev);
538 * XXX should be taken from not-yet-existing fs abstraction layer.
540 param->ddp_max_name_len = MAXNAMELEN;
541 param->ddp_max_nlink = 1 << 31; /* it's 8byte on a disk */
542 param->ddp_block_shift = 12; /* XXX */
543 param->ddp_mount_type = LDD_MT_ZFS;
545 param->ddp_mntopts = MNTOPT_USERXATTR;
546 if (osd->od_posix_acl)
547 param->ddp_mntopts |= MNTOPT_ACL;
548 param->ddp_max_ea_size = DXATTR_MAX_ENTRY_SIZE;
550 /* for maxbytes, report same value as ZPL */
551 param->ddp_maxbytes = MAX_LFS_FILESIZE;
553 /* Default reserved fraction of the available space that should be kept
554 * for error margin. Unfortunately, there are many factors that can
555 * impact the overhead with zfs, so let's be very cautious for now and
556 * reserve 20% of the available space which is not given out as grant.
557 * This tunable can be changed on a live system via procfs if needed. */
558 param->ddp_grant_reserved = 20;
560 /* inodes are dynamically allocated, so we report the per-inode space
561 * consumption to upper layers. This static value is not really accurate
562 * and we should use the same logic as in udmu_objset_statfs() to
563 * estimate the real size consumed by an object */
564 param->ddp_inodespace = OSD_DNODE_EST_COUNT;
565 /* per-fragment overhead to be used by the client code */
566 param->ddp_grant_frag = osd_blk_insert_cost(osd);
570 * Concurrency: shouldn't matter.
572 static int osd_sync(const struct lu_env *env, struct dt_device *d)
574 struct osd_device *osd = osd_dt_dev(d);
575 CDEBUG(D_CACHE, "syncing OSD %s\n", LUSTRE_OSD_ZFS_NAME);
576 txg_wait_synced(dmu_objset_pool(osd->od_os), 0ULL);
577 CDEBUG(D_CACHE, "synced OSD %s\n", LUSTRE_OSD_ZFS_NAME);
581 static int osd_commit_async(const struct lu_env *env, struct dt_device *dev)
583 struct osd_device *osd = osd_dt_dev(dev);
584 tx_state_t *tx = &dmu_objset_pool(osd->od_os)->dp_tx;
587 mutex_enter(&tx->tx_sync_lock);
588 txg = tx->tx_open_txg + 1;
589 if (tx->tx_quiesce_txg_waiting < txg) {
590 tx->tx_quiesce_txg_waiting = txg;
591 cv_broadcast(&tx->tx_quiesce_more_cv);
593 mutex_exit(&tx->tx_sync_lock);
599 * Concurrency: shouldn't matter.
601 static int osd_ro(const struct lu_env *env, struct dt_device *d)
603 struct osd_device *osd = osd_dt_dev(d);
606 CERROR("%s: *** setting device %s read-only ***\n",
607 osd->od_svname, LUSTRE_OSD_ZFS_NAME);
609 spa_freeze(dmu_objset_spa(osd->od_os));
614 static struct dt_device_operations osd_dt_ops = {
615 .dt_root_get = osd_root_get,
616 .dt_statfs = osd_statfs,
617 .dt_trans_create = osd_trans_create,
618 .dt_trans_start = osd_trans_start,
619 .dt_trans_stop = osd_trans_stop,
620 .dt_trans_cb_add = osd_trans_cb_add,
621 .dt_conf_get = osd_conf_get,
623 .dt_commit_async = osd_commit_async,
628 * DMU OSD device type methods
630 static int osd_type_init(struct lu_device_type *t)
632 LU_CONTEXT_KEY_INIT(&osd_key);
633 return lu_context_key_register(&osd_key);
636 static void osd_type_fini(struct lu_device_type *t)
638 lu_context_key_degister(&osd_key);
641 static void *osd_key_init(const struct lu_context *ctx,
642 struct lu_context_key *key)
644 struct osd_thread_info *info;
648 info->oti_env = container_of(ctx, struct lu_env, le_ctx);
650 info = ERR_PTR(-ENOMEM);
654 static void osd_key_fini(const struct lu_context *ctx,
655 struct lu_context_key *key, void *data)
657 struct osd_thread_info *info = data;
662 static void osd_key_exit(const struct lu_context *ctx,
663 struct lu_context_key *key, void *data)
665 struct osd_thread_info *info = data;
667 memset(info, 0, sizeof(*info));
670 struct lu_context_key osd_key = {
671 .lct_tags = LCT_DT_THREAD | LCT_MD_THREAD | LCT_MG_THREAD | LCT_LOCAL,
672 .lct_init = osd_key_init,
673 .lct_fini = osd_key_fini,
674 .lct_exit = osd_key_exit
677 static void osd_fid_fini(const struct lu_env *env, struct osd_device *osd)
679 if (osd->od_cl_seq == NULL)
682 seq_client_fini(osd->od_cl_seq);
683 OBD_FREE_PTR(osd->od_cl_seq);
684 osd->od_cl_seq = NULL;
687 static int osd_shutdown(const struct lu_env *env, struct osd_device *o)
691 /* shutdown quota slave instance associated with the device */
692 if (o->od_quota_slave != NULL) {
693 qsd_fini(env, o->od_quota_slave);
694 o->od_quota_slave = NULL;
697 osd_fid_fini(env, o);
702 static void osd_xattr_changed_cb(void *arg, uint64_t newval)
704 struct osd_device *osd = arg;
706 osd->od_xattr_in_sa = (newval == ZFS_XATTR_SA);
709 static void osd_recordsize_changed_cb(void *arg, uint64_t newval)
711 struct osd_device *osd = arg;
713 LASSERT(newval <= osd_spa_maxblocksize(dmu_objset_spa(osd->od_os)));
714 LASSERT(newval >= SPA_MINBLOCKSIZE);
715 LASSERT(ISP2(newval));
717 osd->od_max_blksz = newval;
721 * This function unregisters all registered callbacks. It's harmless to
722 * unregister callbacks that were never registered so it is used to safely
723 * unwind a partially completed call to osd_objset_register_callbacks().
725 static void osd_objset_unregister_callbacks(struct osd_device *o)
727 struct dsl_dataset *ds = dmu_objset_ds(o->od_os);
729 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_XATTR),
730 osd_xattr_changed_cb, o);
731 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_RECORDSIZE),
732 osd_recordsize_changed_cb, o);
734 if (o->arc_prune_cb != NULL) {
735 arc_remove_prune_callback(o->arc_prune_cb);
736 o->arc_prune_cb = NULL;
741 * Register the required callbacks to be notified when zfs properties
742 * are modified using the 'zfs(8)' command line utility.
744 static int osd_objset_register_callbacks(struct osd_device *o)
746 struct dsl_dataset *ds = dmu_objset_ds(o->od_os);
747 dsl_pool_t *dp = dmu_objset_pool(o->od_os);
753 dsl_pool_config_enter(dp, FTAG);
754 rc = -dsl_prop_register(ds, zfs_prop_to_name(ZFS_PROP_XATTR),
755 osd_xattr_changed_cb, o);
759 rc = -dsl_prop_register(ds, zfs_prop_to_name(ZFS_PROP_RECORDSIZE),
760 osd_recordsize_changed_cb, o);
764 o->arc_prune_cb = arc_add_prune_callback(arc_prune_func, o);
766 dsl_pool_config_exit(dp, FTAG);
768 osd_objset_unregister_callbacks(o);
773 static int osd_objset_open(struct osd_device *o)
775 uint64_t version = ZPL_VERSION;
780 rc = -dmu_objset_own(o->od_mntdev, DMU_OST_ZFS, B_FALSE, o, &o->od_os);
786 /* Check ZFS version */
787 rc = -zap_lookup(o->od_os, MASTER_NODE_OBJ,
788 ZPL_VERSION_STR, 8, 1, &version);
790 CERROR("%s: Error looking up ZPL VERSION\n", o->od_mntdev);
792 * We can't return ENOENT because that would mean the objset
795 GOTO(out, rc = -EIO);
798 rc = -zap_lookup(o->od_os, MASTER_NODE_OBJ,
799 ZFS_SA_ATTRS, 8, 1, &sa_obj);
803 rc = -sa_setup(o->od_os, sa_obj, zfs_attr_table,
804 ZPL_END, &o->z_attr_table);
808 rc = -zap_lookup(o->od_os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ,
809 8, 1, &o->od_rootid);
811 CERROR("%s: lookup for root failed: rc = %d\n",
816 rc = -zap_lookup(o->od_os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET,
817 8, 1, &o->od_unlinkedid);
819 CERROR("%s: lookup for %s failed: rc = %d\n",
820 o->od_svname, ZFS_UNLINKED_SET, rc);
824 /* Check that user/group usage tracking is supported */
825 if (!dmu_objset_userused_enabled(o->od_os) ||
826 DMU_USERUSED_DNODE(o->od_os)->dn_type != DMU_OT_USERGROUP_USED ||
827 DMU_GROUPUSED_DNODE(o->od_os)->dn_type != DMU_OT_USERGROUP_USED) {
828 CERROR("%s: Space accounting not supported by this target, "
829 "aborting\n", o->od_svname);
830 GOTO(out, -ENOTSUPP);
834 if (rc != 0 && o->od_os != NULL) {
835 dmu_objset_disown(o->od_os, o);
843 osd_unlinked_object_free(struct osd_device *osd, uint64_t oid)
848 rc = -dmu_free_long_range(osd->od_os, oid, 0, DMU_OBJECT_END);
850 CWARN("%s: Cannot truncate "LPU64": rc = %d\n",
851 osd->od_svname, oid, rc);
855 tx = dmu_tx_create(osd->od_os);
856 dmu_tx_hold_free(tx, oid, 0, DMU_OBJECT_END);
857 dmu_tx_hold_zap(tx, osd->od_unlinkedid, FALSE, NULL);
858 rc = -dmu_tx_assign(tx, TXG_WAIT);
860 CWARN("%s: Cannot assign tx for "LPU64": rc = %d\n",
861 osd->od_svname, oid, rc);
865 rc = -zap_remove_int(osd->od_os, osd->od_unlinkedid, oid, tx);
867 CWARN("%s: Cannot remove "LPU64" from unlinked set: rc = %d\n",
868 osd->od_svname, oid, rc);
872 rc = -dmu_object_free(osd->od_os, oid, tx);
874 CWARN("%s: Cannot free "LPU64": rc = %d\n",
875 osd->od_svname, oid, rc);
890 osd_unlinked_drain(const struct lu_env *env, struct osd_device *osd)
893 zap_attribute_t *za = &osd_oti_get(env)->oti_za;
895 zap_cursor_init(&zc, osd->od_os, osd->od_unlinkedid);
897 while (zap_cursor_retrieve(&zc, za) == 0) {
898 /* If cannot free the object, leave it in the unlinked set,
899 * until the OSD is mounted again when obd_unlinked_drain()
901 if (osd_unlinked_object_free(osd, za->za_first_integer) != 0)
903 zap_cursor_advance(&zc);
906 zap_cursor_fini(&zc);
909 static int osd_mount(const struct lu_env *env,
910 struct osd_device *o, struct lustre_cfg *cfg)
912 char *mntdev = lustre_cfg_string(cfg, 1);
913 char *svname = lustre_cfg_string(cfg, 4);
919 if (o->od_os != NULL)
922 if (mntdev == NULL || svname == NULL)
925 rc = strlcpy(o->od_mntdev, mntdev, sizeof(o->od_mntdev));
926 if (rc >= sizeof(o->od_mntdev))
929 rc = strlcpy(o->od_svname, svname, sizeof(o->od_svname));
930 if (rc >= sizeof(o->od_svname))
933 if (server_name_is_ost(o->od_svname))
936 rc = osd_objset_open(o);
940 o->od_xattr_in_sa = B_TRUE;
941 o->od_max_blksz = SPA_OLD_MAXBLOCKSIZE;
943 rc = osd_objset_register_callbacks(o);
947 rc = __osd_obj2dbuf(env, o->od_os, o->od_rootid, &rootdb);
951 o->od_root = rootdb->db_object;
952 sa_buf_rele(rootdb, osd_obj_tag);
954 /* 1. initialize oi before any file create or file open */
955 rc = osd_oi_init(env, o);
959 rc = lu_site_init(&o->od_site, osd2lu_dev(o));
962 o->od_site.ls_bottom_dev = osd2lu_dev(o);
964 rc = lu_site_init_finish(&o->od_site);
968 rc = osd_convert_root_to_new_seq(env, o);
972 /* Use our own ZAP for inode accounting by default, this can be changed
973 * via procfs to estimate the inode usage from the block usage */
974 o->od_quota_iused_est = 0;
976 rc = osd_procfs_init(o, o->od_svname);
980 /* initialize quota slave instance */
981 o->od_quota_slave = qsd_init(env, o->od_svname, &o->od_dt_dev,
983 if (IS_ERR(o->od_quota_slave)) {
984 rc = PTR_ERR(o->od_quota_slave);
985 o->od_quota_slave = NULL;
989 /* parse mount option "noacl", and enable ACL by default */
990 opts = lustre_cfg_string(cfg, 3);
991 if (opts == NULL || strstr(opts, "noacl") == NULL)
994 osd_unlinked_drain(env, o);
997 dmu_objset_disown(o->od_os, o);
1004 static void osd_umount(const struct lu_env *env, struct osd_device *o)
1008 if (atomic_read(&o->od_zerocopy_alloc))
1009 CERROR("%s: lost %d allocated page(s)\n", o->od_svname,
1010 atomic_read(&o->od_zerocopy_alloc));
1011 if (atomic_read(&o->od_zerocopy_loan))
1012 CERROR("%s: lost %d loaned abuf(s)\n", o->od_svname,
1013 atomic_read(&o->od_zerocopy_loan));
1014 if (atomic_read(&o->od_zerocopy_pin))
1015 CERROR("%s: lost %d pinned dbuf(s)\n", o->od_svname,
1016 atomic_read(&o->od_zerocopy_pin));
1018 if (o->od_os != NULL) {
1019 /* force a txg sync to get all commit callbacks */
1020 txg_wait_synced(dmu_objset_pool(o->od_os), 0ULL);
1022 /* close the object set */
1023 dmu_objset_disown(o->od_os, o);
1031 static int osd_device_init0(const struct lu_env *env,
1032 struct osd_device *o,
1033 struct lustre_cfg *cfg)
1035 struct lu_device *l = osd2lu_dev(o);
1038 /* if the module was re-loaded, env can loose its keys */
1039 rc = lu_env_refill((struct lu_env *) env);
1043 l->ld_ops = &osd_lu_ops;
1044 o->od_dt_dev.dd_ops = &osd_dt_ops;
1050 static struct lu_device *osd_device_fini(const struct lu_env *env,
1051 struct lu_device *dev);
1053 static struct lu_device *osd_device_alloc(const struct lu_env *env,
1054 struct lu_device_type *type,
1055 struct lustre_cfg *cfg)
1057 struct osd_device *dev;
1062 return ERR_PTR(-ENOMEM);
1064 rc = dt_device_init(&dev->od_dt_dev, type);
1066 rc = osd_device_init0(env, dev, cfg);
1068 rc = osd_mount(env, dev, cfg);
1070 osd_device_fini(env, osd2lu_dev(dev));
1073 dt_device_fini(&dev->od_dt_dev);
1076 if (unlikely(rc != 0))
1079 return rc == 0 ? osd2lu_dev(dev) : ERR_PTR(rc);
1082 static struct lu_device *osd_device_free(const struct lu_env *env,
1083 struct lu_device *d)
1085 struct osd_device *o = osd_dev(d);
1088 /* XXX: make osd top device in order to release reference */
1089 d->ld_site->ls_top_dev = d;
1090 lu_site_purge(env, d->ld_site, -1);
1091 if (!cfs_hash_is_empty(d->ld_site->ls_obj_hash)) {
1092 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
1093 lu_site_print(env, d->ld_site, &msgdata, lu_cdebug_printer);
1095 lu_site_fini(&o->od_site);
1096 dt_device_fini(&o->od_dt_dev);
1102 static struct lu_device *osd_device_fini(const struct lu_env *env,
1103 struct lu_device *d)
1105 struct osd_device *o = osd_dev(d);
1110 osd_shutdown(env, o);
1111 osd_oi_fini(env, o);
1114 osd_objset_unregister_callbacks(o);
1115 osd_sync(env, lu2dt_dev(d));
1116 txg_wait_callbacks(spa_get_dsl(dmu_objset_spa(o->od_os)));
1119 rc = osd_procfs_fini(o);
1121 CERROR("proc fini error %d\n", rc);
1122 RETURN(ERR_PTR(rc));
1131 static int osd_device_init(const struct lu_env *env, struct lu_device *d,
1132 const char *name, struct lu_device *next)
1138 * To be removed, setup is performed by osd_device_{init,alloc} and
1139 * cleanup is performed by osd_device_{fini,free).
1141 static int osd_process_config(const struct lu_env *env,
1142 struct lu_device *d, struct lustre_cfg *cfg)
1144 struct osd_device *o = osd_dev(d);
1148 switch(cfg->lcfg_command) {
1150 rc = osd_mount(env, o, cfg);
1153 rc = osd_shutdown(env, o);
1156 LASSERT(&o->od_dt_dev);
1157 rc = class_process_proc_param(PARAM_OSD, lprocfs_osd_obd_vars,
1158 cfg, &o->od_dt_dev);
1159 if (rc > 0 || rc == -ENOSYS)
1160 rc = class_process_proc_param(PARAM_OST,
1161 lprocfs_osd_obd_vars,
1162 cfg, &o->od_dt_dev);
1172 static int osd_recovery_complete(const struct lu_env *env, struct lu_device *d)
1174 struct osd_device *osd = osd_dev(d);
1178 if (osd->od_quota_slave == NULL)
1181 /* start qsd instance on recovery completion, this notifies the quota
1182 * slave code that we are about to process new requests now */
1183 rc = qsd_start(env, osd->od_quota_slave);
1188 * we use exports to track all osd users
1190 static int osd_obd_connect(const struct lu_env *env, struct obd_export **exp,
1191 struct obd_device *obd, struct obd_uuid *cluuid,
1192 struct obd_connect_data *data, void *localdata)
1194 struct osd_device *osd = osd_dev(obd->obd_lu_dev);
1195 struct lustre_handle conn;
1199 CDEBUG(D_CONFIG, "connect #%d\n", osd->od_connects);
1201 rc = class_connect(&conn, obd, cluuid);
1205 *exp = class_conn2export(&conn);
1207 spin_lock(&obd->obd_dev_lock);
1209 spin_unlock(&obd->obd_dev_lock);
1215 * once last export (we don't count self-export) disappeared
1216 * osd can be released
1218 static int osd_obd_disconnect(struct obd_export *exp)
1220 struct obd_device *obd = exp->exp_obd;
1221 struct osd_device *osd = osd_dev(obd->obd_lu_dev);
1222 int rc, release = 0;
1225 /* Only disconnect the underlying layers on the final disconnect. */
1226 spin_lock(&obd->obd_dev_lock);
1228 if (osd->od_connects == 0)
1230 spin_unlock(&obd->obd_dev_lock);
1232 rc = class_disconnect(exp); /* bz 9811 */
1234 if (rc == 0 && release)
1235 class_manual_cleanup(obd);
1239 static int osd_fid_init(const struct lu_env *env, struct osd_device *osd)
1241 struct seq_server_site *ss = osd_seq_site(osd);
1245 if (osd->od_is_ost || osd->od_cl_seq != NULL)
1248 if (unlikely(ss == NULL))
1251 OBD_ALLOC_PTR(osd->od_cl_seq);
1252 if (osd->od_cl_seq == NULL)
1255 rc = seq_client_init(osd->od_cl_seq, NULL, LUSTRE_SEQ_METADATA,
1256 osd->od_svname, ss->ss_server_seq);
1259 OBD_FREE_PTR(osd->od_cl_seq);
1260 osd->od_cl_seq = NULL;
1266 static int osd_prepare(const struct lu_env *env, struct lu_device *pdev,
1267 struct lu_device *dev)
1269 struct osd_device *osd = osd_dev(dev);
1273 if (osd->od_quota_slave != NULL) {
1274 /* set up quota slave objects */
1275 rc = qsd_prepare(env, osd->od_quota_slave);
1280 rc = osd_fid_init(env, osd);
1285 struct lu_device_operations osd_lu_ops = {
1286 .ldo_object_alloc = osd_object_alloc,
1287 .ldo_process_config = osd_process_config,
1288 .ldo_recovery_complete = osd_recovery_complete,
1289 .ldo_prepare = osd_prepare,
1292 static void osd_type_start(struct lu_device_type *t)
1296 static void osd_type_stop(struct lu_device_type *t)
1300 int osd_fid_alloc(const struct lu_env *env, struct obd_export *exp,
1301 struct lu_fid *fid, struct md_op_data *op_data)
1303 struct osd_device *osd = osd_dev(exp->exp_obd->obd_lu_dev);
1305 return seq_client_alloc_fid(env, osd->od_cl_seq, fid);
1308 static struct lu_device_type_operations osd_device_type_ops = {
1309 .ldto_init = osd_type_init,
1310 .ldto_fini = osd_type_fini,
1312 .ldto_start = osd_type_start,
1313 .ldto_stop = osd_type_stop,
1315 .ldto_device_alloc = osd_device_alloc,
1316 .ldto_device_free = osd_device_free,
1318 .ldto_device_init = osd_device_init,
1319 .ldto_device_fini = osd_device_fini
1322 static struct lu_device_type osd_device_type = {
1323 .ldt_tags = LU_DEVICE_DT,
1324 .ldt_name = LUSTRE_OSD_ZFS_NAME,
1325 .ldt_ops = &osd_device_type_ops,
1326 .ldt_ctx_tags = LCT_LOCAL
1330 static struct obd_ops osd_obd_device_ops = {
1331 .o_owner = THIS_MODULE,
1332 .o_connect = osd_obd_connect,
1333 .o_disconnect = osd_obd_disconnect,
1334 .o_fid_alloc = osd_fid_alloc
1337 int __init osd_init(void)
1341 rc = osd_options_init();
1345 rc = lu_kmem_init(osd_caches);
1349 rc = class_register_type(&osd_obd_device_ops, NULL, true, NULL,
1350 LUSTRE_OSD_ZFS_NAME, &osd_device_type);
1352 lu_kmem_fini(osd_caches);
1356 void __exit osd_exit(void)
1358 class_unregister_type(LUSTRE_OSD_ZFS_NAME);
1359 lu_kmem_fini(osd_caches);
1362 extern unsigned int osd_oi_count;
1363 CFS_MODULE_PARM(osd_oi_count, "i", int, 0444,
1364 "Number of Object Index containers to be created, "
1365 "it's only valid for new filesystem.");
1367 MODULE_AUTHOR("Sun Microsystems, Inc. <http://www.lustre.org/>");
1368 MODULE_DESCRIPTION("Lustre Object Storage Device ("LUSTRE_OSD_ZFS_NAME")");
1369 MODULE_VERSION(LUSTRE_VERSION_STRING);
1370 MODULE_LICENSE("GPL");
1372 module_init(osd_init);
1373 module_exit(osd_exit);