4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2012, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * lustre/osd-zfs/osd_handler.c
33 * Top-level entry points into osd module
35 * Author: Alex Zhuravlev <bzzz@whamcloud.com>
36 * Author: Mike Pershin <tappro@whamcloud.com>
37 * Author: Johann Lombardi <johann@whamcloud.com>
40 #define DEBUG_SUBSYSTEM S_OSD
42 #include <libcfs/libcfs.h>
43 #include <obd_support.h>
44 #include <lustre_net.h>
46 #include <obd_class.h>
47 #include <lustre_disk.h>
48 #include <lustre_fid.h>
49 #include <uapi/linux/lustre/lustre_param.h>
50 #include <md_object.h>
52 #include "osd_internal.h"
54 #include <sys/dnode.h>
59 #include <sys/spa_impl.h>
60 #include <sys/zfs_znode.h>
61 #include <sys/dmu_tx.h>
62 #include <sys/dmu_objset.h>
63 #include <sys/dsl_prop.h>
64 #include <sys/sa_impl.h>
67 struct lu_context_key osd_key;
69 static int osd_txg_sync_delay_us = -1;
71 /* Slab for OSD object allocation */
72 struct kmem_cache *osd_object_kmem;
74 /* Slab to allocate osd_zap_it */
75 struct kmem_cache *osd_zapit_cachep;
77 static struct lu_kmem_descr osd_caches[] = {
79 .ckd_cache = &osd_object_kmem,
80 .ckd_name = "zfs_osd_obj",
81 .ckd_size = sizeof(struct osd_object)
84 .ckd_cache = &osd_zapit_cachep,
85 .ckd_name = "osd_zapit_cache",
86 .ckd_size = sizeof(struct osd_zap_it)
93 static void arc_prune_func(int64_t bytes, void *private)
95 struct osd_device *od = private;
96 struct lu_site *site = &od->od_site;
100 LASSERT(site->ls_obj_hash);
102 rc = lu_env_init(&env, LCT_SHRINKER);
104 CERROR("%s: can't initialize shrinker env: rc = %d\n",
109 lu_site_purge(&env, site, (bytes >> 10));
115 * Concurrency: doesn't access mutable data
117 static int osd_root_get(const struct lu_env *env,
118 struct dt_device *dev, struct lu_fid *f)
120 lu_local_obj_fid(f, OSD_FS_ROOT_OID);
125 * OSD object methods.
129 * Concurrency: shouldn't matter.
131 static void osd_trans_commit_cb(void *cb_data, int error)
133 struct osd_thandle *oh = cb_data;
134 struct thandle *th = &oh->ot_super;
135 struct osd_device *osd = osd_dt_dev(th->th_dev);
136 struct lu_device *lud = &th->th_dev->dd_lu_dev;
137 struct dt_txn_commit_cb *dcb, *tmp;
142 if (error == ECANCELED)
143 CWARN("%s: transaction @0x%p was aborted\n",
144 osd_dt_dev(th->th_dev)->od_svname, th);
146 CERROR("%s: transaction @0x%p commit error: rc = %d\n",
147 osd_dt_dev(th->th_dev)->od_svname, th, error);
150 dt_txn_hook_commit(th);
152 /* call per-transaction callbacks if any */
153 list_for_each_entry_safe(dcb, tmp, &oh->ot_dcb_list, dcb_linkage) {
154 LASSERTF(dcb->dcb_magic == TRANS_COMMIT_CB_MAGIC,
155 "commit callback entry: magic=%x name='%s'\n",
156 dcb->dcb_magic, dcb->dcb_name);
157 list_del_init(&dcb->dcb_linkage);
158 dcb->dcb_func(NULL, th, dcb, error);
161 /* Unlike ldiskfs, zfs updates space accounting at commit time.
162 * As a consequence, op_end is called only now to inform the quota slave
163 * component that reserved quota space is now accounted in usage and
164 * should be released. Quota space won't be adjusted at this point since
165 * we can't provide a suitable environment. It will be performed
166 * asynchronously by a lquota thread. */
167 qsd_op_end(NULL, osd->od_quota_slave, &oh->ot_quota_trans);
176 static int osd_trans_cb_add(struct thandle *th, struct dt_txn_commit_cb *dcb)
178 struct osd_thandle *oh = container_of0(th, struct osd_thandle,
181 LASSERT(dcb->dcb_magic == TRANS_COMMIT_CB_MAGIC);
182 LASSERT(&dcb->dcb_func != NULL);
183 if (dcb->dcb_flags & DCB_TRANS_STOP)
184 list_add(&dcb->dcb_linkage, &oh->ot_stop_dcb_list);
186 list_add(&dcb->dcb_linkage, &oh->ot_dcb_list);
192 * Concurrency: shouldn't matter.
194 static int osd_trans_start(const struct lu_env *env, struct dt_device *d,
197 struct osd_device *osd = osd_dt_dev(d);
198 struct osd_thandle *oh;
203 oh = container_of0(th, struct osd_thandle, ot_super);
207 rc = dt_txn_hook_start(env, d, th);
209 CERROR("%s: dt_txn_hook_start failed: rc = %d\n",
214 if (OBD_FAIL_CHECK(OBD_FAIL_OSD_TXN_START))
215 /* Unlike ldiskfs, ZFS checks for available space and returns
216 * -ENOSPC when assigning txg */
219 rc = -dmu_tx_assign(oh->ot_tx, TXG_WAIT);
220 if (unlikely(rc != 0)) {
221 /* dmu will call commit callback with error code during abort */
222 if (!lu_device_is_md(&d->dd_lu_dev) && rc == -ENOSPC)
223 CERROR("%s: failed to start transaction due to ENOSPC"
224 "\n", osd->od_svname);
226 CERROR("%s: can't assign tx: rc = %d\n",
229 /* add commit callback */
230 dmu_tx_callback_register(oh->ot_tx, osd_trans_commit_cb, oh);
232 osd_oti_get(env)->oti_in_trans = 1;
233 lu_device_get(&d->dd_lu_dev);
239 static void osd_unlinked_list_emptify(const struct lu_env *env,
240 struct osd_device *osd,
241 struct list_head *list, bool free)
243 struct osd_object *obj;
246 while (!list_empty(list)) {
247 obj = list_entry(list->next,
248 struct osd_object, oo_unlinked_linkage);
249 LASSERT(obj->oo_dn != NULL);
250 oid = obj->oo_dn->dn_object;
252 list_del_init(&obj->oo_unlinked_linkage);
254 (void)osd_unlinked_object_free(env, osd, oid);
258 static void osd_trans_stop_cb(struct osd_thandle *oth, int result)
260 struct dt_txn_commit_cb *dcb;
261 struct dt_txn_commit_cb *tmp;
263 /* call per-transaction stop callbacks if any */
264 list_for_each_entry_safe(dcb, tmp, &oth->ot_stop_dcb_list,
266 LASSERTF(dcb->dcb_magic == TRANS_COMMIT_CB_MAGIC,
267 "commit callback entry: magic=%x name='%s'\n",
268 dcb->dcb_magic, dcb->dcb_name);
269 list_del_init(&dcb->dcb_linkage);
270 dcb->dcb_func(NULL, &oth->ot_super, dcb, result);
275 * Concurrency: shouldn't matter.
277 static int osd_trans_stop(const struct lu_env *env, struct dt_device *dt,
280 struct osd_device *osd = osd_dt_dev(th->th_dev);
281 bool sync = (th->th_sync != 0);
282 struct osd_thandle *oh;
283 struct list_head unlinked;
288 oh = container_of0(th, struct osd_thandle, ot_super);
289 INIT_LIST_HEAD(&unlinked);
290 list_splice_init(&oh->ot_unlinked_list, &unlinked);
292 osd_oti_get(env)->oti_ins_cache_depth--;
293 /* reset OI cache for safety */
294 if (osd_oti_get(env)->oti_ins_cache_depth == 0)
295 osd_oti_get(env)->oti_ins_cache_used = 0;
297 if (oh->ot_assigned == 0) {
299 CDEBUG(D_OTHER, "%s: transaction is aborted\n", osd->od_svname);
300 osd_trans_stop_cb(oh, th->th_result);
301 dmu_tx_abort(oh->ot_tx);
302 osd_object_sa_dirty_rele(env, oh);
303 osd_unlinked_list_emptify(env, osd, &unlinked, false);
304 /* there won't be any commit, release reserved quota space now,
306 qsd_op_end(env, osd->od_quota_slave, &oh->ot_quota_trans);
311 rc = dt_txn_hook_stop(env, th);
313 CDEBUG(D_OTHER, "%s: transaction hook failed: rc = %d\n",
316 osd_trans_stop_cb(oh, rc);
319 txg = oh->ot_tx->tx_txg;
321 osd_object_sa_dirty_rele(env, oh);
322 /* XXX: Once dmu_tx_commit() called, oh/th could have been freed
323 * by osd_trans_commit_cb already. */
324 dmu_tx_commit(oh->ot_tx);
325 osd_oti_get(env)->oti_in_trans = 0;
327 osd_unlinked_list_emptify(env, osd, &unlinked, true);
330 if (osd_txg_sync_delay_us < 0)
331 txg_wait_synced(dmu_objset_pool(osd->od_os), txg);
333 udelay(osd_txg_sync_delay_us);
339 static struct thandle *osd_trans_create(const struct lu_env *env,
340 struct dt_device *dt)
342 struct osd_device *osd = osd_dt_dev(dt);
343 struct osd_thandle *oh;
349 CERROR("%s: someone try to start transaction under "
350 "readonly mode, should be disabled.\n",
351 osd_name(osd_dt_dev(dt)));
353 RETURN(ERR_PTR(-EROFS));
356 tx = dmu_tx_create(osd->od_os);
358 RETURN(ERR_PTR(-ENOMEM));
360 /* alloc callback data */
364 RETURN(ERR_PTR(-ENOMEM));
368 INIT_LIST_HEAD(&oh->ot_dcb_list);
369 INIT_LIST_HEAD(&oh->ot_stop_dcb_list);
370 INIT_LIST_HEAD(&oh->ot_unlinked_list);
371 INIT_LIST_HEAD(&oh->ot_sa_list);
372 memset(&oh->ot_quota_trans, 0, sizeof(oh->ot_quota_trans));
377 osd_oti_get(env)->oti_ins_cache_depth++;
382 /* Estimate the total number of objects from a number of blocks */
383 uint64_t osd_objs_count_estimate(uint64_t usedbytes, uint64_t usedobjs,
384 uint64_t nrblocks, uint64_t est_maxblockshift)
386 uint64_t est_totobjs, est_usedblocks, est_usedobjs;
389 * If blocksize is below 64KB (e.g. MDT with recordsize=4096) then
390 * bump the free dnode estimate to assume blocks at least 64KB in
391 * case of a directory-heavy MDT (at 32KB/directory).
393 if (est_maxblockshift < 16) {
394 nrblocks >>= (16 - est_maxblockshift);
395 est_maxblockshift = 16;
399 * Estimate the total number of dnodes from the total blocks count
400 * and the space used per dnode. Since we don't know the overhead
401 * associated with each dnode (xattrs, SAs, VDEV overhead, etc.)
402 * just using DNODE_SHIFT isn't going to give a good estimate.
403 * Instead, compute the current average space usage per dnode, with
404 * an upper and lower cap to avoid unrealistic estimates..
406 * In case there aren't many dnodes or blocks used yet, add a small
407 * correction factor (OSD_DNODE_EST_{COUNT,BLKSHIFT}). This factor
408 * gradually disappears as the number of real dnodes grows. It also
409 * avoids the need to check for divide-by-zero computing dn_per_block.
411 CLASSERT(OSD_DNODE_MIN_BLKSHIFT > 0);
412 CLASSERT(OSD_DNODE_EST_BLKSHIFT > 0);
414 est_usedblocks = ((OSD_DNODE_EST_COUNT << OSD_DNODE_EST_BLKSHIFT) +
415 usedbytes) >> est_maxblockshift;
416 est_usedobjs = OSD_DNODE_EST_COUNT + usedobjs;
418 if (est_usedobjs <= est_usedblocks) {
420 * Average space/dnode more than maximum block size, use max
421 * block size to estimate free dnodes from adjusted free blocks
422 * count. OSTs typically use multiple blocks per dnode so this
425 est_totobjs = nrblocks;
427 } else if (est_usedobjs >= (est_usedblocks << OSD_DNODE_MIN_BLKSHIFT)) {
429 * Average space/dnode smaller than min dnode size (probably
430 * due to metadnode compression), use min dnode size to
431 * estimate object count. MDTs may use only one block per node
432 * so this case applies.
434 est_totobjs = nrblocks << OSD_DNODE_MIN_BLKSHIFT;
438 * Between the extremes, use average space per existing dnode
439 * to compute the number of dnodes that will fit into nrblocks:
441 * est_totobjs = nrblocks * (est_usedobjs / est_usedblocks)
443 * this may overflow 64 bits or become 0 if not handled well.
445 * We know nrblocks is below 2^(64 - blkbits) bits, and
446 * est_usedobjs is under 48 bits due to DN_MAX_OBJECT_SHIFT,
447 * which means that multiplying them may get as large as
448 * 2 ^ 96 for the minimum blocksize of 64KB allowed above.
450 * The ratio of dnodes per block (est_usedobjs / est_usedblocks)
451 * is under 2^(blkbits - DNODE_SHIFT) = blocksize / 512 due to
452 * the limit checks above, so we can safely compute this first.
453 * We care more about accuracy on the MDT (many dnodes/block)
454 * which is good because this is where truncation errors are
455 * smallest. Since both nrblocks and dn_per_block are a
456 * function of blkbits, their product is at most:
458 * 2^(64 - blkbits) * 2^(blkbits - DNODE_SHIFT) = 2^(64 - 9)
460 * so we can safely use 7 bits to compute a fixed-point
461 * fraction and est_totobjs can still fit in 64 bits.
463 unsigned dn_per_block = (est_usedobjs << 7) / est_usedblocks;
465 est_totobjs = (nrblocks * dn_per_block) >> 7;
470 static int osd_objset_statfs(struct osd_device *osd, struct obd_statfs *osfs)
472 struct objset *os = osd->od_os;
473 uint64_t usedbytes, availbytes, usedobjs, availobjs;
474 uint64_t est_availobjs;
478 dmu_objset_space(os, &usedbytes, &availbytes, &usedobjs, &availobjs);
480 memset(osfs, 0, sizeof(*osfs));
482 /* We're a zfs filesystem. */
483 osfs->os_type = UBERBLOCK_MAGIC;
486 * ZFS allows multiple block sizes. For statfs, Linux makes no
487 * proper distinction between bsize and frsize. For calculations
488 * of free and used blocks incorrectly uses bsize instead of frsize,
489 * but bsize is also used as the optimal blocksize. We return the
490 * largest possible block size as IO size for the optimum performance
491 * and scale the free and used blocks count appropriately.
493 osfs->os_bsize = osd->od_max_blksz;
494 bshift = fls64(osfs->os_bsize) - 1;
496 osfs->os_blocks = (usedbytes + availbytes) >> bshift;
497 osfs->os_bfree = availbytes >> bshift;
498 osfs->os_bavail = osfs->os_bfree; /* no extra root reservation */
500 /* Take replication (i.e. number of copies) into account */
501 if (os->os_copies != 0)
502 osfs->os_bavail /= os->os_copies;
505 * Reserve some space so we don't run into ENOSPC due to grants not
506 * accounting for metadata overhead in ZFS, and to avoid fragmentation.
507 * Rather than report this via os_bavail (which makes users unhappy if
508 * they can't fill the filesystem 100%), reduce os_blocks as well.
510 * Reserve 0.78% of total space, at least 16MB for small filesystems,
511 * for internal files to be created/unlinked when space is tight.
513 CLASSERT(OSD_STATFS_RESERVED_SIZE > 0);
514 reserved = OSD_STATFS_RESERVED_SIZE >> bshift;
515 if (likely(osfs->os_blocks >= reserved << OSD_STATFS_RESERVED_SHIFT))
516 reserved = osfs->os_blocks >> OSD_STATFS_RESERVED_SHIFT;
518 osfs->os_blocks -= reserved;
519 osfs->os_bfree -= min(reserved, osfs->os_bfree);
520 osfs->os_bavail -= min(reserved, osfs->os_bavail);
523 * The availobjs value returned from dmu_objset_space() is largely
524 * useless, since it reports the number of objects that might
525 * theoretically still fit into the dataset, independent of minor
526 * issues like how much space is actually available in the pool.
527 * Compute a better estimate in udmu_objs_count_estimate().
529 est_availobjs = osd_objs_count_estimate(usedbytes, usedobjs,
530 osfs->os_bfree, bshift);
532 osfs->os_ffree = min(availobjs, est_availobjs);
533 osfs->os_files = osfs->os_ffree + usedobjs;
535 /* ZFS XXX: fill in backing dataset FSID/UUID
536 memcpy(osfs->os_fsid, .... );*/
538 osfs->os_namelen = MAXNAMELEN;
539 osfs->os_maxbytes = OBD_OBJECT_EOF;
541 if (!spa_writeable(dmu_objset_spa(os)) ||
542 osd->od_dev_set_rdonly || osd->od_prop_rdonly)
543 osfs->os_state |= OS_STATE_READONLY;
549 * Concurrency: shouldn't matter.
551 int osd_statfs(const struct lu_env *env, struct dt_device *d,
552 struct obd_statfs *osfs)
557 rc = osd_objset_statfs(osd_dt_dev(d), osfs);
558 if (unlikely(rc != 0))
561 osfs->os_bavail -= min_t(u64,
562 OSD_GRANT_FOR_LOCAL_OIDS / osfs->os_bsize,
567 static int osd_blk_insert_cost(struct osd_device *osd)
569 int max_blockshift, nr_blkptrshift, bshift;
571 /* max_blockshift is the log2 of the number of blocks needed to reach
572 * the maximum filesize (that's to say 2^64) */
573 bshift = osd_spa_maxblockshift(dmu_objset_spa(osd->od_os));
574 max_blockshift = DN_MAX_OFFSET_SHIFT - bshift;
576 /* nr_blkptrshift is the log2 of the number of block pointers that can
577 * be stored in an indirect block */
578 CLASSERT(DN_MAX_INDBLKSHIFT > SPA_BLKPTRSHIFT);
579 nr_blkptrshift = DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT;
581 /* max_blockshift / nr_blkptrshift is thus the maximum depth of the
582 * tree. We add +1 for rounding purpose.
583 * The tree depth times the indirect block size gives us the maximum
584 * cost of inserting a block in the tree */
585 return (max_blockshift / nr_blkptrshift + 1) * (1<<DN_MAX_INDBLKSHIFT);
589 * Concurrency: doesn't access mutable data.
591 static void osd_conf_get(const struct lu_env *env,
592 const struct dt_device *dev,
593 struct dt_device_param *param)
595 struct osd_device *osd = osd_dt_dev(dev);
598 * XXX should be taken from not-yet-existing fs abstraction layer.
600 param->ddp_max_name_len = MAXNAMELEN;
601 param->ddp_max_nlink = 1 << 31; /* it's 8byte on a disk */
602 param->ddp_symlink_max = PATH_MAX;
603 param->ddp_mount_type = LDD_MT_ZFS;
605 param->ddp_mntopts = MNTOPT_USERXATTR;
606 if (osd->od_posix_acl)
607 param->ddp_mntopts |= MNTOPT_ACL;
608 param->ddp_max_ea_size = DXATTR_MAX_ENTRY_SIZE;
610 /* for maxbytes, report same value as ZPL */
611 param->ddp_maxbytes = MAX_LFS_FILESIZE;
613 /* inodes are dynamically allocated, so we report the per-inode space
614 * consumption to upper layers. This static value is not really accurate
615 * and we should use the same logic as in udmu_objset_statfs() to
616 * estimate the real size consumed by an object */
617 param->ddp_inodespace = OSD_DNODE_EST_COUNT;
618 /* Although ZFS isn't an extent-based filesystem, the metadata overhead
619 * (i.e. 7 levels of indirect blocks, see osd_blk_insert_cost()) should
620 * not be accounted for every single new block insertion.
621 * Instead, the maximum extent size is set to the number of blocks that
622 * can fit into a single contiguous indirect block. There would be some
623 * cases where this crosses indirect blocks, but it also won't have 7
624 * new levels of indirect blocks in that case either, so it will still
625 * have enough reserved space for the extra indirect block */
626 param->ddp_max_extent_blks =
627 (1 << (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT));
628 param->ddp_extent_tax = osd_blk_insert_cost(osd);
630 /* Preferred RPC size for efficient disk IO. 1MB shows good
631 * all-around performance for ZFS, but use blocksize (recordsize)
632 * by default if larger to avoid read-modify-write. */
633 if (osd->od_max_blksz > ONE_MB_BRW_SIZE)
634 param->ddp_brw_size = osd->od_max_blksz;
636 param->ddp_brw_size = ONE_MB_BRW_SIZE;
640 * Concurrency: shouldn't matter.
642 static int osd_sync(const struct lu_env *env, struct dt_device *d)
645 struct osd_device *osd = osd_dt_dev(d);
647 CDEBUG(D_CACHE, "syncing OSD %s\n", LUSTRE_OSD_ZFS_NAME);
648 txg_wait_synced(dmu_objset_pool(osd->od_os), 0ULL);
649 CDEBUG(D_CACHE, "synced OSD %s\n", LUSTRE_OSD_ZFS_NAME);
655 static int osd_commit_async(const struct lu_env *env, struct dt_device *dev)
657 struct osd_device *osd = osd_dt_dev(dev);
658 tx_state_t *tx = &dmu_objset_pool(osd->od_os)->dp_tx;
661 mutex_enter(&tx->tx_sync_lock);
662 txg = tx->tx_open_txg + 1;
663 if (tx->tx_quiesce_txg_waiting < txg) {
664 tx->tx_quiesce_txg_waiting = txg;
665 cv_broadcast(&tx->tx_quiesce_more_cv);
667 mutex_exit(&tx->tx_sync_lock);
673 * Concurrency: shouldn't matter.
675 static int osd_ro(const struct lu_env *env, struct dt_device *d)
677 struct osd_device *osd = osd_dt_dev(d);
680 CERROR("%s: *** setting device %s read-only ***\n",
681 osd->od_svname, LUSTRE_OSD_ZFS_NAME);
682 osd->od_dev_set_rdonly = 1;
683 spa_freeze(dmu_objset_spa(osd->od_os));
688 static struct dt_device_operations osd_dt_ops = {
689 .dt_root_get = osd_root_get,
690 .dt_statfs = osd_statfs,
691 .dt_trans_create = osd_trans_create,
692 .dt_trans_start = osd_trans_start,
693 .dt_trans_stop = osd_trans_stop,
694 .dt_trans_cb_add = osd_trans_cb_add,
695 .dt_conf_get = osd_conf_get,
697 .dt_commit_async = osd_commit_async,
702 * DMU OSD device type methods
704 static int osd_type_init(struct lu_device_type *t)
706 LU_CONTEXT_KEY_INIT(&osd_key);
707 return lu_context_key_register(&osd_key);
710 static void osd_type_fini(struct lu_device_type *t)
712 lu_context_key_degister(&osd_key);
715 static void *osd_key_init(const struct lu_context *ctx,
716 struct lu_context_key *key)
718 struct osd_thread_info *info;
722 info->oti_env = container_of(ctx, struct lu_env, le_ctx);
724 info = ERR_PTR(-ENOMEM);
728 static void osd_key_fini(const struct lu_context *ctx,
729 struct lu_context_key *key, void *data)
731 struct osd_thread_info *info = data;
732 struct osd_idmap_cache *idc = info->oti_ins_cache;
735 LASSERT(info->oti_ins_cache_size > 0);
736 OBD_FREE(idc, sizeof(*idc) * info->oti_ins_cache_size);
737 info->oti_ins_cache = NULL;
738 info->oti_ins_cache_size = 0;
740 lu_buf_free(&info->oti_xattr_lbuf);
744 static void osd_key_exit(const struct lu_context *ctx,
745 struct lu_context_key *key, void *data)
749 struct lu_context_key osd_key = {
750 .lct_tags = LCT_DT_THREAD | LCT_MD_THREAD | LCT_MG_THREAD | LCT_LOCAL,
751 .lct_init = osd_key_init,
752 .lct_fini = osd_key_fini,
753 .lct_exit = osd_key_exit
756 static void osd_fid_fini(const struct lu_env *env, struct osd_device *osd)
758 if (osd->od_cl_seq == NULL)
761 seq_client_fini(osd->od_cl_seq);
762 OBD_FREE_PTR(osd->od_cl_seq);
763 osd->od_cl_seq = NULL;
766 static int osd_shutdown(const struct lu_env *env, struct osd_device *o)
770 /* shutdown quota slave instance associated with the device */
771 if (o->od_quota_slave != NULL) {
772 /* complete all in-flight callbacks */
773 osd_sync(env, &o->od_dt_dev);
774 txg_wait_callbacks(spa_get_dsl(dmu_objset_spa(o->od_os)));
775 qsd_fini(env, o->od_quota_slave);
776 o->od_quota_slave = NULL;
779 osd_fid_fini(env, o);
784 static void osd_xattr_changed_cb(void *arg, uint64_t newval)
786 struct osd_device *osd = arg;
788 osd->od_xattr_in_sa = (newval == ZFS_XATTR_SA);
791 static void osd_recordsize_changed_cb(void *arg, uint64_t newval)
793 struct osd_device *osd = arg;
795 LASSERT(newval <= osd_spa_maxblocksize(dmu_objset_spa(osd->od_os)));
796 LASSERT(newval >= SPA_MINBLOCKSIZE);
797 LASSERT(ISP2(newval));
799 osd->od_max_blksz = newval;
802 static void osd_readonly_changed_cb(void *arg, uint64_t newval)
804 struct osd_device *osd = arg;
806 osd->od_prop_rdonly = !!newval;
809 #ifdef HAVE_DMU_OBJECT_ALLOC_DNSIZE
810 static void osd_dnodesize_changed_cb(void *arg, uint64_t newval)
812 struct osd_device *osd = arg;
814 osd->od_dnsize = newval;
818 * This function unregisters all registered callbacks. It's harmless to
819 * unregister callbacks that were never registered so it is used to safely
820 * unwind a partially completed call to osd_objset_register_callbacks().
822 static void osd_objset_unregister_callbacks(struct osd_device *o)
824 struct dsl_dataset *ds = dmu_objset_ds(o->od_os);
826 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_XATTR),
827 osd_xattr_changed_cb, o);
828 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_RECORDSIZE),
829 osd_recordsize_changed_cb, o);
830 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_READONLY),
831 osd_readonly_changed_cb, o);
832 #ifdef HAVE_DMU_OBJECT_ALLOC_DNSIZE
833 (void) dsl_prop_unregister(ds, zfs_prop_to_name(ZFS_PROP_DNODESIZE),
834 osd_dnodesize_changed_cb, o);
837 if (o->arc_prune_cb != NULL) {
838 arc_remove_prune_callback(o->arc_prune_cb);
839 o->arc_prune_cb = NULL;
844 * Register the required callbacks to be notified when zfs properties
845 * are modified using the 'zfs(8)' command line utility.
847 static int osd_objset_register_callbacks(struct osd_device *o)
849 struct dsl_dataset *ds = dmu_objset_ds(o->od_os);
850 dsl_pool_t *dp = dmu_objset_pool(o->od_os);
856 dsl_pool_config_enter(dp, FTAG);
857 rc = -dsl_prop_register(ds, zfs_prop_to_name(ZFS_PROP_XATTR),
858 osd_xattr_changed_cb, o);
862 rc = -dsl_prop_register(ds, zfs_prop_to_name(ZFS_PROP_RECORDSIZE),
863 osd_recordsize_changed_cb, o);
867 rc = -dsl_prop_register(ds, zfs_prop_to_name(ZFS_PROP_READONLY),
868 osd_readonly_changed_cb, o);
872 #ifdef HAVE_DMU_OBJECT_ALLOC_DNSIZE
873 rc = -dsl_prop_register(ds, zfs_prop_to_name(ZFS_PROP_DNODESIZE),
874 osd_dnodesize_changed_cb, o);
879 o->arc_prune_cb = arc_add_prune_callback(arc_prune_func, o);
881 dsl_pool_config_exit(dp, FTAG);
883 osd_objset_unregister_callbacks(o);
888 static int osd_objset_open(struct osd_device *o)
890 uint64_t version = ZPL_VERSION;
891 uint64_t sa_obj, unlink_obj;
895 rc = -osd_dmu_objset_own(o->od_mntdev, DMU_OST_ZFS,
896 o->od_dt_dev.dd_rdonly ? B_TRUE : B_FALSE,
897 B_FALSE, o, &o->od_os);
900 CERROR("%s: can't open %s\n", o->od_svname, o->od_mntdev);
906 /* Check ZFS version */
907 rc = -zap_lookup(o->od_os, MASTER_NODE_OBJ,
908 ZPL_VERSION_STR, 8, 1, &version);
910 CERROR("%s: Error looking up ZPL VERSION\n", o->od_mntdev);
912 * We can't return ENOENT because that would mean the objset
915 GOTO(out, rc = -EIO);
918 rc = -zap_lookup(o->od_os, MASTER_NODE_OBJ,
919 ZFS_SA_ATTRS, 8, 1, &sa_obj);
923 rc = -sa_setup(o->od_os, sa_obj, zfs_attr_table,
924 ZPL_END, &o->z_attr_table);
928 rc = -zap_lookup(o->od_os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ,
929 8, 1, &o->od_rootid);
931 CERROR("%s: lookup for root failed: rc = %d\n",
936 rc = -zap_lookup(o->od_os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET,
939 CERROR("%s: lookup for %s failed: rc = %d\n",
940 o->od_svname, ZFS_UNLINKED_SET, rc);
944 /* Check that user/group usage tracking is supported */
945 if (!dmu_objset_userused_enabled(o->od_os) ||
946 DMU_USERUSED_DNODE(o->od_os)->dn_type != DMU_OT_USERGROUP_USED ||
947 DMU_GROUPUSED_DNODE(o->od_os)->dn_type != DMU_OT_USERGROUP_USED) {
948 CERROR("%s: Space accounting not supported by this target, "
949 "aborting\n", o->od_svname);
950 GOTO(out, rc = -ENOTSUPP);
953 rc = __osd_obj2dnode(o->od_os, unlink_obj, &o->od_unlinked);
955 CERROR("%s: can't get dnode for unlinked: rc = %d\n",
961 if (rc != 0 && o->od_os != NULL) {
962 osd_dmu_objset_disown(o->od_os, B_FALSE, o);
969 int osd_unlinked_object_free(const struct lu_env *env, struct osd_device *osd,
972 char *key = osd_oti_get(env)->oti_str;
976 if (osd->od_dt_dev.dd_rdonly) {
977 CERROR("%s: someone try to free objects under "
978 "readonly mode, should be disabled.\n", osd_name(osd));
984 rc = -dmu_free_long_range(osd->od_os, oid, 0, DMU_OBJECT_END);
986 CWARN("%s: Cannot truncate %llu: rc = %d\n",
987 osd->od_svname, oid, rc);
991 tx = dmu_tx_create(osd->od_os);
992 dmu_tx_mark_netfree(tx);
993 dmu_tx_hold_free(tx, oid, 0, DMU_OBJECT_END);
994 osd_tx_hold_zap(tx, osd->od_unlinked->dn_object, osd->od_unlinked,
996 rc = -dmu_tx_assign(tx, TXG_WAIT);
998 CWARN("%s: Cannot assign tx for %llu: rc = %d\n",
999 osd->od_svname, oid, rc);
1003 snprintf(key, sizeof(osd_oti_get(env)->oti_str), "%llx", oid);
1004 rc = osd_zap_remove(osd, osd->od_unlinked->dn_object,
1005 osd->od_unlinked, key, tx);
1007 CWARN("%s: Cannot remove %llu from unlinked set: rc = %d\n",
1008 osd->od_svname, oid, rc);
1012 rc = -dmu_object_free(osd->od_os, oid, tx);
1014 CWARN("%s: Cannot free %llu: rc = %d\n",
1015 osd->od_svname, oid, rc);
1030 osd_unlinked_drain(const struct lu_env *env, struct osd_device *osd)
1033 zap_attribute_t *za = &osd_oti_get(env)->oti_za;
1035 zap_cursor_init(&zc, osd->od_os, osd->od_unlinked->dn_object);
1037 while (zap_cursor_retrieve(&zc, za) == 0) {
1038 /* If cannot free the object, leave it in the unlinked set,
1039 * until the OSD is mounted again when obd_unlinked_drain()
1040 * will be called. */
1041 if (osd_unlinked_object_free(env, osd, za->za_first_integer))
1043 zap_cursor_advance(&zc);
1046 zap_cursor_fini(&zc);
1049 static int osd_mount(const struct lu_env *env,
1050 struct osd_device *o, struct lustre_cfg *cfg)
1052 char *mntdev = lustre_cfg_string(cfg, 1);
1053 char *str = lustre_cfg_string(cfg, 2);
1054 char *svname = lustre_cfg_string(cfg, 4);
1060 if (o->od_os != NULL)
1063 if (mntdev == NULL || svname == NULL)
1066 rc = strlcpy(o->od_mntdev, mntdev, sizeof(o->od_mntdev));
1067 if (rc >= sizeof(o->od_mntdev))
1070 rc = strlcpy(o->od_svname, svname, sizeof(o->od_svname));
1071 if (rc >= sizeof(o->od_svname))
1074 o->od_index_backup_stop = 0;
1075 o->od_index = -1; /* -1 means index is invalid */
1076 rc = server_name2index(o->od_svname, &o->od_index, NULL);
1077 str = strstr(str, ":");
1079 unsigned long flags;
1081 rc = kstrtoul(str + 1, 10, &flags);
1085 if (flags & LMD_FLG_DEV_RDONLY) {
1086 o->od_dt_dev.dd_rdonly = 1;
1087 LCONSOLE_WARN("%s: set dev_rdonly on this device\n",
1091 if (flags & LMD_FLG_NOSCRUB)
1092 o->od_auto_scrub_interval = AS_NEVER;
1095 if (server_name_is_ost(o->od_svname))
1098 rc = osd_objset_open(o);
1102 o->od_xattr_in_sa = B_TRUE;
1103 o->od_max_blksz = osd_spa_maxblocksize(o->od_os->os_spa);
1104 o->od_readcache_max_filesize = OSD_MAX_CACHE_SIZE;
1106 rc = __osd_obj2dnode(o->od_os, o->od_rootid, &rootdn);
1109 o->od_root = rootdn->dn_object;
1110 osd_dnode_rele(rootdn);
1112 rc = __osd_obj2dnode(o->od_os, DMU_USERUSED_OBJECT,
1113 &o->od_userused_dn);
1117 rc = __osd_obj2dnode(o->od_os, DMU_GROUPUSED_OBJECT,
1118 &o->od_groupused_dn);
1122 #ifdef ZFS_PROJINHERIT
1123 if (dmu_objset_projectquota_enabled(o->od_os)) {
1124 rc = __osd_obj2dnode(o->od_os, DMU_PROJECTUSED_OBJECT,
1125 &o->od_projectused_dn);
1126 if (rc && rc != -ENOENT)
1131 rc = lu_site_init(&o->od_site, osd2lu_dev(o));
1134 o->od_site.ls_bottom_dev = osd2lu_dev(o);
1136 rc = lu_site_init_finish(&o->od_site);
1140 rc = osd_objset_register_callbacks(o);
1145 rc = osd_scrub_setup(env, o);
1150 rc = osd_procfs_init(o, o->od_svname);
1154 /* initialize quota slave instance */
1155 o->od_quota_slave = qsd_init(env, o->od_svname, &o->od_dt_dev,
1157 if (IS_ERR(o->od_quota_slave)) {
1158 rc = PTR_ERR(o->od_quota_slave);
1159 o->od_quota_slave = NULL;
1163 #ifdef HAVE_DMU_USEROBJ_ACCOUNTING
1164 if (!osd_dmu_userobj_accounting_available(o))
1165 CWARN("%s: dnode accounting not enabled: "
1166 "enable feature@userobj_accounting in pool\n",
1170 /* parse mount option "noacl", and enable ACL by default */
1171 opts = lustre_cfg_string(cfg, 3);
1172 if (opts == NULL || strstr(opts, "noacl") == NULL)
1173 o->od_posix_acl = 1;
1175 osd_unlinked_drain(env, o);
1177 if (rc && o->od_os) {
1178 osd_dmu_objset_disown(o->od_os, B_FALSE, o);
1185 static void osd_umount(const struct lu_env *env, struct osd_device *o)
1189 if (atomic_read(&o->od_zerocopy_alloc))
1190 CERROR("%s: lost %d allocated page(s)\n", o->od_svname,
1191 atomic_read(&o->od_zerocopy_alloc));
1192 if (atomic_read(&o->od_zerocopy_loan))
1193 CERROR("%s: lost %d loaned abuf(s)\n", o->od_svname,
1194 atomic_read(&o->od_zerocopy_loan));
1195 if (atomic_read(&o->od_zerocopy_pin))
1196 CERROR("%s: lost %d pinned dbuf(s)\n", o->od_svname,
1197 atomic_read(&o->od_zerocopy_pin));
1199 if (o->od_unlinked) {
1200 osd_dnode_rele(o->od_unlinked);
1201 o->od_unlinked = NULL;
1203 if (o->od_userused_dn) {
1204 osd_dnode_rele(o->od_userused_dn);
1205 o->od_userused_dn = NULL;
1207 if (o->od_groupused_dn) {
1208 osd_dnode_rele(o->od_groupused_dn);
1209 o->od_groupused_dn = NULL;
1212 #ifdef ZFS_PROJINHERIT
1213 if (o->od_projectused_dn) {
1214 osd_dnode_rele(o->od_projectused_dn);
1215 o->od_projectused_dn = NULL;
1219 if (o->od_os != NULL) {
1220 if (!o->od_dt_dev.dd_rdonly)
1221 /* force a txg sync to get all commit callbacks */
1222 txg_wait_synced(dmu_objset_pool(o->od_os), 0ULL);
1224 /* close the object set */
1225 osd_dmu_objset_disown(o->od_os, B_FALSE, o);
1232 static int osd_device_init0(const struct lu_env *env,
1233 struct osd_device *o,
1234 struct lustre_cfg *cfg)
1236 struct lu_device *l = osd2lu_dev(o);
1239 /* if the module was re-loaded, env can loose its keys */
1240 rc = lu_env_refill((struct lu_env *) env);
1244 l->ld_ops = &osd_lu_ops;
1245 o->od_dt_dev.dd_ops = &osd_dt_ops;
1246 sema_init(&o->od_otable_sem, 1);
1247 INIT_LIST_HEAD(&o->od_ios_list);
1248 o->od_auto_scrub_interval = AS_DEFAULT;
1254 static struct lu_device *osd_device_fini(const struct lu_env *env,
1255 struct lu_device *dev);
1257 static struct lu_device *osd_device_alloc(const struct lu_env *env,
1258 struct lu_device_type *type,
1259 struct lustre_cfg *cfg)
1261 struct osd_device *dev;
1262 struct osd_seq_list *osl;
1267 return ERR_PTR(-ENOMEM);
1269 osl = &dev->od_seq_list;
1270 INIT_LIST_HEAD(&osl->osl_seq_list);
1271 rwlock_init(&osl->osl_seq_list_lock);
1272 sema_init(&osl->osl_seq_init_sem, 1);
1273 INIT_LIST_HEAD(&dev->od_index_backup_list);
1274 INIT_LIST_HEAD(&dev->od_index_restore_list);
1275 spin_lock_init(&dev->od_lock);
1276 dev->od_index_backup_policy = LIBP_NONE;
1278 rc = dt_device_init(&dev->od_dt_dev, type);
1280 rc = osd_device_init0(env, dev, cfg);
1282 rc = osd_mount(env, dev, cfg);
1284 osd_device_fini(env, osd2lu_dev(dev));
1287 dt_device_fini(&dev->od_dt_dev);
1290 if (unlikely(rc != 0))
1293 return rc == 0 ? osd2lu_dev(dev) : ERR_PTR(rc);
1296 static struct lu_device *osd_device_free(const struct lu_env *env,
1297 struct lu_device *d)
1299 struct osd_device *o = osd_dev(d);
1302 /* XXX: make osd top device in order to release reference */
1303 d->ld_site->ls_top_dev = d;
1304 lu_site_purge(env, d->ld_site, -1);
1305 if (!cfs_hash_is_empty(d->ld_site->ls_obj_hash)) {
1306 LIBCFS_DEBUG_MSG_DATA_DECL(msgdata, D_ERROR, NULL);
1307 lu_site_print(env, d->ld_site, &msgdata, lu_cdebug_printer);
1309 lu_site_fini(&o->od_site);
1310 dt_device_fini(&o->od_dt_dev);
1316 static struct lu_device *osd_device_fini(const struct lu_env *env,
1317 struct lu_device *d)
1319 struct osd_device *o = osd_dev(d);
1325 osd_objset_unregister_callbacks(o);
1326 if (!o->od_dt_dev.dd_rdonly) {
1327 osd_sync(env, lu2dt_dev(d));
1329 spa_get_dsl(dmu_objset_spa(o->od_os)));
1333 /* now with all the callbacks completed we can cleanup the remainings */
1334 osd_shutdown(env, o);
1335 osd_scrub_cleanup(env, o);
1337 rc = osd_procfs_fini(o);
1339 CERROR("proc fini error %d\n", rc);
1340 RETURN(ERR_PTR(rc));
1349 static int osd_device_init(const struct lu_env *env, struct lu_device *d,
1350 const char *name, struct lu_device *next)
1356 * To be removed, setup is performed by osd_device_{init,alloc} and
1357 * cleanup is performed by osd_device_{fini,free).
1359 static int osd_process_config(const struct lu_env *env,
1360 struct lu_device *d, struct lustre_cfg *cfg)
1362 struct osd_device *o = osd_dev(d);
1366 switch(cfg->lcfg_command) {
1368 rc = osd_mount(env, o, cfg);
1371 /* For the case LCFG_PRE_CLEANUP is not called in advance,
1372 * that may happend if hit failure during mount process. */
1373 osd_index_backup(env, o, false);
1374 rc = osd_shutdown(env, o);
1377 LASSERT(&o->od_dt_dev);
1378 rc = class_process_proc_param(PARAM_OSD, lprocfs_osd_obd_vars,
1379 cfg, &o->od_dt_dev);
1380 if (rc > 0 || rc == -ENOSYS) {
1381 rc = class_process_proc_param(PARAM_OST,
1382 lprocfs_osd_obd_vars,
1383 cfg, &o->od_dt_dev);
1389 case LCFG_PRE_CLEANUP:
1391 osd_index_backup(env, o,
1392 o->od_index_backup_policy != LIBP_NONE);
1402 static int osd_recovery_complete(const struct lu_env *env, struct lu_device *d)
1404 struct osd_device *osd = osd_dev(d);
1408 if (osd->od_quota_slave == NULL)
1411 /* start qsd instance on recovery completion, this notifies the quota
1412 * slave code that we are about to process new requests now */
1413 rc = qsd_start(env, osd->od_quota_slave);
1418 * we use exports to track all osd users
1420 static int osd_obd_connect(const struct lu_env *env, struct obd_export **exp,
1421 struct obd_device *obd, struct obd_uuid *cluuid,
1422 struct obd_connect_data *data, void *localdata)
1424 struct osd_device *osd = osd_dev(obd->obd_lu_dev);
1425 struct lustre_handle conn;
1429 CDEBUG(D_CONFIG, "connect #%d\n", osd->od_connects);
1431 rc = class_connect(&conn, obd, cluuid);
1435 *exp = class_conn2export(&conn);
1437 spin_lock(&obd->obd_dev_lock);
1439 spin_unlock(&obd->obd_dev_lock);
1445 * once last export (we don't count self-export) disappeared
1446 * osd can be released
1448 static int osd_obd_disconnect(struct obd_export *exp)
1450 struct obd_device *obd = exp->exp_obd;
1451 struct osd_device *osd = osd_dev(obd->obd_lu_dev);
1452 int rc, release = 0;
1455 /* Only disconnect the underlying layers on the final disconnect. */
1456 spin_lock(&obd->obd_dev_lock);
1458 if (osd->od_connects == 0)
1460 spin_unlock(&obd->obd_dev_lock);
1462 rc = class_disconnect(exp); /* bz 9811 */
1464 if (rc == 0 && release)
1465 class_manual_cleanup(obd);
1469 static int osd_fid_init(const struct lu_env *env, struct osd_device *osd)
1471 struct seq_server_site *ss = osd_seq_site(osd);
1475 if (osd->od_is_ost || osd->od_cl_seq != NULL)
1478 if (unlikely(ss == NULL))
1481 OBD_ALLOC_PTR(osd->od_cl_seq);
1482 if (osd->od_cl_seq == NULL)
1485 rc = seq_client_init(osd->od_cl_seq, NULL, LUSTRE_SEQ_METADATA,
1486 osd->od_svname, ss->ss_server_seq);
1489 OBD_FREE_PTR(osd->od_cl_seq);
1490 osd->od_cl_seq = NULL;
1496 static int osd_prepare(const struct lu_env *env, struct lu_device *pdev,
1497 struct lu_device *dev)
1499 struct osd_device *osd = osd_dev(dev);
1503 if (osd->od_quota_slave != NULL) {
1504 /* set up quota slave objects */
1505 rc = qsd_prepare(env, osd->od_quota_slave);
1510 rc = osd_fid_init(env, osd);
1515 struct lu_device_operations osd_lu_ops = {
1516 .ldo_object_alloc = osd_object_alloc,
1517 .ldo_process_config = osd_process_config,
1518 .ldo_recovery_complete = osd_recovery_complete,
1519 .ldo_prepare = osd_prepare,
1522 static void osd_type_start(struct lu_device_type *t)
1526 static void osd_type_stop(struct lu_device_type *t)
1530 int osd_fid_alloc(const struct lu_env *env, struct obd_export *exp,
1531 struct lu_fid *fid, struct md_op_data *op_data)
1533 struct osd_device *osd = osd_dev(exp->exp_obd->obd_lu_dev);
1535 return seq_client_alloc_fid(env, osd->od_cl_seq, fid);
1538 static struct lu_device_type_operations osd_device_type_ops = {
1539 .ldto_init = osd_type_init,
1540 .ldto_fini = osd_type_fini,
1542 .ldto_start = osd_type_start,
1543 .ldto_stop = osd_type_stop,
1545 .ldto_device_alloc = osd_device_alloc,
1546 .ldto_device_free = osd_device_free,
1548 .ldto_device_init = osd_device_init,
1549 .ldto_device_fini = osd_device_fini
1552 static struct lu_device_type osd_device_type = {
1553 .ldt_tags = LU_DEVICE_DT,
1554 .ldt_name = LUSTRE_OSD_ZFS_NAME,
1555 .ldt_ops = &osd_device_type_ops,
1556 .ldt_ctx_tags = LCT_LOCAL
1560 static struct obd_ops osd_obd_device_ops = {
1561 .o_owner = THIS_MODULE,
1562 .o_connect = osd_obd_connect,
1563 .o_disconnect = osd_obd_disconnect,
1564 .o_fid_alloc = osd_fid_alloc
1567 static int __init osd_init(void)
1571 rc = osd_options_init();
1575 rc = lu_kmem_init(osd_caches);
1579 rc = class_register_type(&osd_obd_device_ops, NULL, true, NULL,
1580 LUSTRE_OSD_ZFS_NAME, &osd_device_type);
1582 lu_kmem_fini(osd_caches);
1586 static void __exit osd_exit(void)
1588 class_unregister_type(LUSTRE_OSD_ZFS_NAME);
1589 lu_kmem_fini(osd_caches);
1592 module_param(osd_oi_count, int, 0444);
1593 MODULE_PARM_DESC(osd_oi_count, "Number of Object Index containers to be created, it's only valid for new filesystem.");
1595 module_param(osd_txg_sync_delay_us, int, 0644);
1596 MODULE_PARM_DESC(osd_txg_sync_delay_us,
1597 "When zero or larger delay N usec instead of doing TXG sync");
1599 MODULE_AUTHOR("OpenSFS, Inc. <http://www.lustre.org/>");
1600 MODULE_DESCRIPTION("Lustre Object Storage Device ("LUSTRE_OSD_ZFS_NAME")");
1601 MODULE_VERSION(LUSTRE_VERSION_STRING);
1602 MODULE_LICENSE("GPL");
1604 module_init(osd_init);
1605 module_exit(osd_exit);