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) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2017, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
32 * Implementation of cl_object for LOV layer.
34 * Author: Nikita Danilov <nikita.danilov@sun.com>
35 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
38 #define DEBUG_SUBSYSTEM S_LOV
40 #include <linux/random.h>
42 #include "lov_cl_internal.h"
44 static inline struct lov_device *lov_object_dev(struct lov_object *obj)
46 return lu2lov_dev(obj->lo_cl.co_lu.lo_dev);
53 /*****************************************************************************
59 struct lov_layout_operations {
60 int (*llo_init)(const struct lu_env *env, struct lov_device *dev,
61 struct lov_object *lov, struct lov_stripe_md *lsm,
62 const struct cl_object_conf *conf,
63 union lov_layout_state *state);
64 int (*llo_delete)(const struct lu_env *env, struct lov_object *lov,
65 union lov_layout_state *state);
66 void (*llo_fini)(const struct lu_env *env, struct lov_object *lov,
67 union lov_layout_state *state);
68 int (*llo_print)(const struct lu_env *env, void *cookie,
69 lu_printer_t p, const struct lu_object *o);
70 int (*llo_page_init)(const struct lu_env *env, struct cl_object *obj,
71 struct cl_page *page, pgoff_t index);
72 int (*llo_lock_init)(const struct lu_env *env,
73 struct cl_object *obj, struct cl_lock *lock,
74 const struct cl_io *io);
75 int (*llo_io_init)(const struct lu_env *env,
76 struct cl_object *obj, struct cl_io *io);
77 int (*llo_getattr)(const struct lu_env *env, struct cl_object *obj,
78 struct cl_attr *attr);
79 int (*llo_flush)(const struct lu_env *env, struct cl_object *obj,
80 struct ldlm_lock *lock);
83 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov);
84 static struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov);
86 static void lov_lsm_put(struct lov_stripe_md *lsm)
92 /*****************************************************************************
94 * Lov object layout operations.
98 static struct cl_object *lov_sub_find(const struct lu_env *env,
99 struct cl_device *dev,
100 const struct lu_fid *fid,
101 const struct cl_object_conf *conf)
107 o = lu_object_find_at(env, cl2lu_dev(dev), fid, &conf->coc_lu);
108 LASSERT(ergo(!IS_ERR(o), o->lo_dev->ld_type == &lovsub_device_type));
112 static int lov_page_slice_fixup(struct lov_object *lov,
113 struct cl_object *stripe)
115 struct cl_object_header *hdr = cl_object_header(&lov->lo_cl);
119 return hdr->coh_page_bufsize - lov->lo_cl.co_slice_off -
120 cfs_size_round(sizeof(struct lov_page));
122 cl_object_for_each(o, stripe)
123 o->co_slice_off += hdr->coh_page_bufsize;
125 return cl_object_header(stripe)->coh_page_bufsize;
128 static int lov_init_sub(const struct lu_env *env, struct lov_object *lov,
129 struct cl_object *subobj, struct lov_oinfo *oinfo,
132 struct cl_object_header *hdr;
133 struct cl_object_header *subhdr;
134 struct cl_object_header *parent;
135 int entry = lov_comp_entry(idx);
136 int stripe = lov_comp_stripe(idx);
139 if (OBD_FAIL_CHECK(OBD_FAIL_LOV_INIT)) {
140 /* For sanity:test_206.
141 * Do not leave the object in cache to avoid accessing
142 * freed memory. This is because osc_object is referring to
143 * lov_oinfo of lsm_stripe_data which will be freed due to
145 cl_object_kill(env, subobj);
146 cl_object_put(env, subobj);
150 hdr = cl_object_header(lov2cl(lov));
151 subhdr = cl_object_header(subobj);
153 CDEBUG(D_INODE, DFID"@%p[%d:%d] -> "DFID"@%p: ostid: "DOSTID
154 " ost idx: %d gen: %d\n",
155 PFID(lu_object_fid(&subobj->co_lu)), subhdr, entry, stripe,
156 PFID(lu_object_fid(lov2lu(lov))), hdr, POSTID(&oinfo->loi_oi),
157 oinfo->loi_ost_idx, oinfo->loi_ost_gen);
159 /* reuse ->coh_attr_guard to protect coh_parent change */
160 spin_lock(&subhdr->coh_attr_guard);
161 parent = subhdr->coh_parent;
162 if (parent == NULL) {
163 struct lovsub_object *lso = cl2lovsub(subobj);
165 subhdr->coh_parent = hdr;
166 spin_unlock(&subhdr->coh_attr_guard);
167 subhdr->coh_nesting = hdr->coh_nesting + 1;
168 lu_object_ref_add(&subobj->co_lu, "lov-parent", lov);
169 lso->lso_super = lov;
170 lso->lso_index = idx;
173 struct lu_object *old_obj;
174 struct lov_object *old_lov;
175 unsigned int mask = D_INODE;
177 spin_unlock(&subhdr->coh_attr_guard);
178 old_obj = lu_object_locate(&parent->coh_lu, &lov_device_type);
179 LASSERT(old_obj != NULL);
180 old_lov = cl2lov(lu2cl(old_obj));
181 if (old_lov->lo_layout_invalid) {
182 /* the object's layout has already changed but isn't
184 lu_object_unhash(env, &subobj->co_lu);
191 LU_OBJECT_DEBUG(mask, env, &subobj->co_lu,
192 "stripe %d is already owned.", idx);
193 LU_OBJECT_DEBUG(mask, env, old_obj, "owned.");
194 LU_OBJECT_HEADER(mask, env, lov2lu(lov), "try to own.\n");
195 cl_object_put(env, subobj);
200 static int lov_init_raid0(const struct lu_env *env, struct lov_device *dev,
201 struct lov_object *lov, unsigned int index,
202 const struct cl_object_conf *conf,
203 struct lov_layout_entry *lle)
205 struct lov_layout_raid0 *r0 = &lle->lle_raid0;
206 struct lov_thread_info *lti = lov_env_info(env);
207 struct cl_object_conf *subconf = <i->lti_stripe_conf;
208 struct lu_fid *ofid = <i->lti_fid;
209 struct cl_object *stripe;
210 struct lov_stripe_md_entry *lse = lov_lse(lov, index);
217 spin_lock_init(&r0->lo_sub_lock);
218 r0->lo_nr = lse->lsme_stripe_count;
220 OBD_ALLOC_PTR_ARRAY_LARGE(r0->lo_sub, r0->lo_nr);
221 if (r0->lo_sub == NULL)
222 GOTO(out, result = -ENOMEM);
226 memset(subconf, 0, sizeof(*subconf));
229 * Create stripe cl_objects.
231 for (i = 0; i < r0->lo_nr; ++i) {
232 struct cl_device *subdev;
233 struct lov_oinfo *oinfo = lse->lsme_oinfo[i];
234 int ost_idx = oinfo->loi_ost_idx;
236 if (lov_oinfo_is_dummy(oinfo))
239 result = ostid_to_fid(ofid, &oinfo->loi_oi, oinfo->loi_ost_idx);
243 if (dev->ld_target[ost_idx] == NULL) {
244 CERROR("%s: OST %04x is not initialized\n",
245 lov2obd(dev->ld_lov)->obd_name, ost_idx);
246 GOTO(out, result = -EIO);
249 subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
250 subconf->u.coc_oinfo = oinfo;
251 LASSERTF(subdev != NULL, "not init ost %d\n", ost_idx);
252 /* In the function below, .hs_keycmp resolves to
253 * lu_obj_hop_keycmp() */
254 /* coverity[overrun-buffer-val] */
255 stripe = lov_sub_find(env, subdev, ofid, subconf);
257 GOTO(out, result = PTR_ERR(stripe));
259 result = lov_init_sub(env, lov, stripe, oinfo,
260 lov_comp_index(index, i));
261 if (result == -EAGAIN) { /* try again */
268 r0->lo_sub[i] = cl2lovsub(stripe);
270 sz = lov_page_slice_fixup(lov, stripe);
271 LASSERT(ergo(psz > 0, psz == sz));
281 static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
282 struct lov_layout_raid0 *r0,
283 struct lovsub_object *los, int idx)
285 struct cl_object *sub;
286 struct lu_site *site;
287 wait_queue_head_t *wq;
289 LASSERT(r0->lo_sub[idx] == los);
291 sub = lovsub2cl(los);
292 site = sub->co_lu.lo_dev->ld_site;
293 wq = lu_site_wq_from_fid(site, &sub->co_lu.lo_header->loh_fid);
295 cl_object_kill(env, sub);
296 /* release a reference to the sub-object and ... */
297 lu_object_ref_del(&sub->co_lu, "lov-parent", lov);
298 cl_object_put(env, sub);
300 /* ... wait until it is actually destroyed---sub-object clears its
301 * ->lo_sub[] slot in lovsub_object_free() */
302 wait_event(*wq, r0->lo_sub[idx] != los);
303 LASSERT(r0->lo_sub[idx] == NULL);
306 static void lov_delete_raid0(const struct lu_env *env, struct lov_object *lov,
307 struct lov_layout_entry *lle)
309 struct lov_layout_raid0 *r0 = &lle->lle_raid0;
313 if (r0->lo_sub != NULL) {
316 for (i = 0; i < r0->lo_nr; ++i) {
317 struct lovsub_object *los = r0->lo_sub[i];
320 cl_object_prune(env, &los->lso_cl);
322 * If top-level object is to be evicted from
323 * the cache, so are its sub-objects.
325 lov_subobject_kill(env, lov, r0, los, i);
333 static void lov_fini_raid0(const struct lu_env *env,
334 struct lov_layout_entry *lle)
336 struct lov_layout_raid0 *r0 = &lle->lle_raid0;
338 if (r0->lo_sub != NULL) {
339 OBD_FREE_PTR_ARRAY_LARGE(r0->lo_sub, r0->lo_nr);
344 static int lov_print_raid0(const struct lu_env *env, void *cookie,
345 lu_printer_t p, const struct lov_layout_entry *lle)
347 const struct lov_layout_raid0 *r0 = &lle->lle_raid0;
350 for (i = 0; i < r0->lo_nr; ++i) {
351 struct lu_object *sub;
353 if (r0->lo_sub[i] != NULL) {
354 sub = lovsub2lu(r0->lo_sub[i]);
355 lu_object_print(env, cookie, p, sub);
357 (*p)(env, cookie, "sub %d absent\n", i);
363 static int lov_attr_get_raid0(const struct lu_env *env, struct lov_object *lov,
364 unsigned int index, struct lov_layout_entry *lle,
365 struct cl_attr **lov_attr)
367 struct lov_layout_raid0 *r0 = &lle->lle_raid0;
368 struct lov_stripe_md *lsm = lov->lo_lsm;
369 struct ost_lvb *lvb = &lov_env_info(env)->lti_lvb;
370 struct cl_attr *attr = &r0->lo_attr;
374 if (r0->lo_attr_valid) {
379 memset(lvb, 0, sizeof(*lvb));
381 /* XXX: timestamps can be negative by sanity:test_39m,
383 lvb->lvb_atime = LLONG_MIN;
384 lvb->lvb_ctime = LLONG_MIN;
385 lvb->lvb_mtime = LLONG_MIN;
388 * XXX that should be replaced with a loop over sub-objects,
389 * doing cl_object_attr_get() on them. But for now, let's
390 * reuse old lov code.
394 * XXX take lsm spin-lock to keep lov_merge_lvb_kms()
395 * happy. It's not needed, because new code uses
396 * ->coh_attr_guard spin-lock to protect consistency of
397 * sub-object attributes.
399 lov_stripe_lock(lsm);
400 result = lov_merge_lvb_kms(lsm, index, lvb, &kms);
401 lov_stripe_unlock(lsm);
403 cl_lvb2attr(attr, lvb);
405 r0->lo_attr_valid = 1;
412 static struct lov_comp_layout_entry_ops raid0_ops = {
413 .lco_init = lov_init_raid0,
414 .lco_fini = lov_fini_raid0,
415 .lco_getattr = lov_attr_get_raid0,
418 static int lov_attr_get_dom(const struct lu_env *env, struct lov_object *lov,
419 unsigned int index, struct lov_layout_entry *lle,
420 struct cl_attr **lov_attr)
422 struct lov_layout_dom *dom = &lle->lle_dom;
423 struct lov_oinfo *loi = dom->lo_loi;
424 struct cl_attr *attr = &dom->lo_dom_r0.lo_attr;
426 if (dom->lo_dom_r0.lo_attr_valid) {
431 if (OST_LVB_IS_ERR(loi->loi_lvb.lvb_blocks))
432 return OST_LVB_GET_ERR(loi->loi_lvb.lvb_blocks);
434 cl_lvb2attr(attr, &loi->loi_lvb);
436 /* DoM component size can be bigger than stripe size after
437 * client's setattr RPC, so do not count anything beyond
438 * component end. Alternatively, check that limit on server
439 * and do not allow size overflow there. */
440 if (attr->cat_size > lle->lle_extent->e_end)
441 attr->cat_size = lle->lle_extent->e_end;
443 attr->cat_kms = attr->cat_size;
445 dom->lo_dom_r0.lo_attr_valid = 1;
452 * Lookup FLD to get MDS index of the given DOM object FID.
454 * \param[in] ld LOV device
455 * \param[in] fid FID to lookup
456 * \param[out] nr index in MDC array to return back
458 * \retval 0 and \a mds filled with MDS index if successful
459 * \retval negative value on error
461 static int lov_fld_lookup(struct lov_device *ld, const struct lu_fid *fid,
469 rc = fld_client_lookup(&ld->ld_lmv->u.lmv.lmv_fld, fid_seq(fid),
470 &mds_idx, LU_SEQ_RANGE_MDT, NULL);
472 CERROR("%s: error while looking for mds number. Seq %#llx"
473 ", err = %d\n", lu_dev_name(cl2lu_dev(&ld->ld_cl)),
478 CDEBUG(D_INODE, "FLD lookup got mds #%x for fid="DFID"\n",
481 /* find proper MDC device in the array */
482 for (i = 0; i < ld->ld_md_tgts_nr; i++) {
483 if (ld->ld_md_tgts[i].ldm_mdc != NULL &&
484 ld->ld_md_tgts[i].ldm_idx == mds_idx)
488 if (i == ld->ld_md_tgts_nr) {
489 CERROR("%s: cannot find corresponding MDC device for mds #%x "
490 "for fid="DFID"\n", lu_dev_name(cl2lu_dev(&ld->ld_cl)),
500 * Implementation of lov_comp_layout_entry_ops::lco_init for DOM object.
502 * Init the DOM object for the first time. It prepares also RAID0 entry
503 * for it to use in common methods with ordinary RAID0 layout entries.
505 * \param[in] env execution environment
506 * \param[in] dev LOV device
507 * \param[in] lov LOV object
508 * \param[in] index Composite layout entry index in LSM
509 * \param[in] lle Composite LOV layout entry
511 static int lov_init_dom(const struct lu_env *env, struct lov_device *dev,
512 struct lov_object *lov, unsigned int index,
513 const struct cl_object_conf *conf,
514 struct lov_layout_entry *lle)
516 struct lov_thread_info *lti = lov_env_info(env);
517 struct lov_stripe_md_entry *lsme = lov_lse(lov, index);
518 struct cl_object *clo;
519 struct lu_object *o = lov2lu(lov);
520 const struct lu_fid *fid = lu_object_fid(o);
521 struct cl_device *mdcdev;
522 struct lov_oinfo *loi = NULL;
523 struct cl_object_conf *sconf = <i->lti_stripe_conf;
529 /* DOM entry may be not zero index due to FLR but must start from 0 */
530 if (unlikely(lle->lle_extent->e_start != 0)) {
531 CERROR("%s: DOM entry must be the first stripe in a mirror\n",
532 lov2obd(dev->ld_lov)->obd_name);
533 dump_lsm(D_ERROR, lov->lo_lsm);
537 /* find proper MDS device */
538 rc = lov_fld_lookup(dev, fid, &idx);
542 LASSERTF(dev->ld_md_tgts[idx].ldm_mdc != NULL,
543 "LOV md target[%u] is NULL\n", idx);
545 /* check lsm is DOM, more checks are needed */
546 LASSERT(lsme->lsme_stripe_count == 0);
549 * Create lower cl_objects.
551 mdcdev = dev->ld_md_tgts[idx].ldm_mdc;
553 LASSERTF(mdcdev != NULL, "non-initialized mdc subdev\n");
555 /* DoM object has no oinfo in LSM entry, create it exclusively */
556 OBD_SLAB_ALLOC_PTR_GFP(loi, lov_oinfo_slab, GFP_NOFS);
560 fid_to_ostid(lu_object_fid(lov2lu(lov)), &loi->loi_oi);
562 sconf->u.coc_oinfo = loi;
564 clo = lov_sub_find(env, mdcdev, fid, sconf);
566 GOTO(out, rc = PTR_ERR(clo));
568 rc = lov_init_sub(env, lov, clo, loi, lov_comp_index(index, 0));
569 if (rc == -EAGAIN) /* try again */
574 lle->lle_dom.lo_dom = cl2lovsub(clo);
575 spin_lock_init(&lle->lle_dom.lo_dom_r0.lo_sub_lock);
576 lle->lle_dom.lo_dom_r0.lo_nr = 1;
577 lle->lle_dom.lo_dom_r0.lo_sub = &lle->lle_dom.lo_dom;
578 lle->lle_dom.lo_loi = loi;
580 rc = lov_page_slice_fixup(lov, clo);
585 OBD_SLAB_FREE_PTR(loi, lov_oinfo_slab);
590 * Implementation of lov_layout_operations::llo_fini for DOM object.
592 * Finish the DOM object and free related memory.
594 * \param[in] env execution environment
595 * \param[in] lov LOV object
596 * \param[in] state LOV layout state
598 static void lov_fini_dom(const struct lu_env *env,
599 struct lov_layout_entry *lle)
601 if (lle->lle_dom.lo_dom != NULL)
602 lle->lle_dom.lo_dom = NULL;
603 if (lle->lle_dom.lo_loi != NULL)
604 OBD_SLAB_FREE_PTR(lle->lle_dom.lo_loi, lov_oinfo_slab);
607 static struct lov_comp_layout_entry_ops dom_ops = {
608 .lco_init = lov_init_dom,
609 .lco_fini = lov_fini_dom,
610 .lco_getattr = lov_attr_get_dom,
613 static int lov_init_composite(const struct lu_env *env, struct lov_device *dev,
614 struct lov_object *lov, struct lov_stripe_md *lsm,
615 const struct cl_object_conf *conf,
616 union lov_layout_state *state)
618 struct lov_layout_composite *comp = &state->composite;
619 struct lov_layout_entry *lle;
620 struct lov_mirror_entry *lre;
621 unsigned int entry_count;
622 unsigned int psz = 0;
623 unsigned int mirror_count;
624 int flr_state = lsm->lsm_flags & LCM_FL_FLR_MASK;
632 LASSERT(lsm->lsm_entry_count > 0);
633 LASSERT(lov->lo_lsm == NULL);
634 lov->lo_lsm = lsm_addref(lsm);
635 lov->lo_layout_invalid = true;
637 dump_lsm(D_INODE, lsm);
639 entry_count = lsm->lsm_entry_count;
641 spin_lock_init(&comp->lo_write_lock);
642 comp->lo_flags = lsm->lsm_flags;
643 comp->lo_mirror_count = lsm->lsm_mirror_count + 1;
644 comp->lo_entry_count = lsm->lsm_entry_count;
645 comp->lo_preferred_mirror = -1;
647 if (equi(flr_state == LCM_FL_NONE, comp->lo_mirror_count > 1))
650 OBD_ALLOC_PTR_ARRAY(comp->lo_mirrors, comp->lo_mirror_count);
651 if (comp->lo_mirrors == NULL)
654 OBD_ALLOC_PTR_ARRAY(comp->lo_entries, entry_count);
655 if (comp->lo_entries == NULL)
658 /* Initiate all entry types and extents data at first */
659 for (i = 0, j = 0, mirror_count = 1; i < entry_count; i++) {
662 lle = &comp->lo_entries[i];
664 lle->lle_lsme = lsm->lsm_entries[i];
665 lle->lle_type = lov_entry_type(lle->lle_lsme);
666 switch (lle->lle_type) {
667 case LOV_PATTERN_RAID0:
668 lle->lle_comp_ops = &raid0_ops;
670 case LOV_PATTERN_MDT:
671 /* Allowed to have several DOM stripes in different
672 * mirrors with the same DoM size.
675 dom_size = lle->lle_lsme->lsme_extent.e_end;
676 } else if (dom_size !=
677 lle->lle_lsme->lsme_extent.e_end) {
678 CERROR("%s: DOM entries with different sizes\n",
679 lov2obd(dev->ld_lov)->obd_name);
680 dump_lsm(D_ERROR, lsm);
683 lle->lle_comp_ops = &dom_ops;
686 CERROR("%s: unknown composite layout entry type %i\n",
687 lov2obd(dev->ld_lov)->obd_name,
688 lsm->lsm_entries[i]->lsme_pattern);
689 dump_lsm(D_ERROR, lsm);
693 lle->lle_extent = &lle->lle_lsme->lsme_extent;
694 lle->lle_valid = !(lle->lle_lsme->lsme_flags & LCME_FL_STALE);
696 if (flr_state != LCM_FL_NONE)
697 mirror_id = mirror_id_of(lle->lle_lsme->lsme_id);
699 lre = &comp->lo_mirrors[j];
701 if (mirror_id == lre->lre_mirror_id) {
702 lre->lre_valid |= lle->lle_valid;
703 lre->lre_stale |= !lle->lle_valid;
708 /* new mirror detected, assume that the mirrors
709 * are shorted in layout */
712 if (j >= comp->lo_mirror_count)
715 lre = &comp->lo_mirrors[j];
718 /* entries must be sorted by mirrors */
719 lre->lre_mirror_id = mirror_id;
720 lre->lre_start = lre->lre_end = i;
721 lre->lre_preferred = !!(lle->lle_lsme->lsme_flags &
723 lre->lre_valid = lle->lle_valid;
724 lre->lre_stale = !lle->lle_valid;
727 /* sanity check for FLR */
728 if (mirror_count != comp->lo_mirror_count) {
730 " doesn't have the # of mirrors it claims, %u/%u\n",
731 PFID(lu_object_fid(lov2lu(lov))), mirror_count,
732 comp->lo_mirror_count + 1);
734 GOTO(out, result = -EINVAL);
737 lov_foreach_layout_entry(lov, lle) {
738 int index = lov_layout_entry_index(lov, lle);
741 * If the component has not been init-ed on MDS side, for
742 * PFL layout, we'd know that the components beyond this one
743 * will be dynamically init-ed later on file write/trunc ops.
745 if (!lsme_inited(lle->lle_lsme))
748 result = lle->lle_comp_ops->lco_init(env, dev, lov, index,
753 LASSERT(ergo(psz > 0, psz == result));
758 cl_object_header(&lov->lo_cl)->coh_page_bufsize += psz;
760 /* decide the preferred mirror. It uses the hash value of lov_object
761 * so that different clients would use different mirrors for read. */
763 seq = hash_long((unsigned long)lov, 8);
764 for (i = 0; i < comp->lo_mirror_count; i++) {
765 unsigned int idx = (i + seq) % comp->lo_mirror_count;
767 lre = lov_mirror_entry(lov, idx);
771 mirror_count++; /* valid mirror */
773 if (lre->lre_preferred || comp->lo_preferred_mirror < 0)
774 comp->lo_preferred_mirror = idx;
778 " doesn't have any valid mirrors\n",
779 PFID(lu_object_fid(lov2lu(lov))));
781 comp->lo_preferred_mirror = 0;
784 LASSERT(comp->lo_preferred_mirror >= 0);
788 return result > 0 ? 0 : result;
791 static int lov_init_empty(const struct lu_env *env, struct lov_device *dev,
792 struct lov_object *lov, struct lov_stripe_md *lsm,
793 const struct cl_object_conf *conf,
794 union lov_layout_state *state)
799 static int lov_init_released(const struct lu_env *env,
800 struct lov_device *dev, struct lov_object *lov,
801 struct lov_stripe_md *lsm,
802 const struct cl_object_conf *conf,
803 union lov_layout_state *state)
805 LASSERT(lsm != NULL);
806 LASSERT(lsm->lsm_is_released);
807 LASSERT(lov->lo_lsm == NULL);
809 lov->lo_lsm = lsm_addref(lsm);
813 static int lov_init_foreign(const struct lu_env *env,
814 struct lov_device *dev, struct lov_object *lov,
815 struct lov_stripe_md *lsm,
816 const struct cl_object_conf *conf,
817 union lov_layout_state *state)
819 LASSERT(lsm != NULL);
820 LASSERT(lov->lo_type == LLT_FOREIGN);
821 LASSERT(lov->lo_lsm == NULL);
823 lov->lo_lsm = lsm_addref(lsm);
827 static int lov_delete_empty(const struct lu_env *env, struct lov_object *lov,
828 union lov_layout_state *state)
830 LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED ||
831 lov->lo_type == LLT_FOREIGN);
833 lov_layout_wait(env, lov);
837 static int lov_delete_composite(const struct lu_env *env,
838 struct lov_object *lov,
839 union lov_layout_state *state)
841 struct lov_layout_entry *entry;
842 struct lov_layout_composite *comp = &state->composite;
846 dump_lsm(D_INODE, lov->lo_lsm);
848 lov_layout_wait(env, lov);
849 if (comp->lo_entries)
850 lov_foreach_layout_entry(lov, entry)
851 lov_delete_raid0(env, lov, entry);
856 static void lov_fini_empty(const struct lu_env *env, struct lov_object *lov,
857 union lov_layout_state *state)
859 LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
862 static void lov_fini_composite(const struct lu_env *env,
863 struct lov_object *lov,
864 union lov_layout_state *state)
866 struct lov_layout_composite *comp = &state->composite;
869 if (comp->lo_entries != NULL) {
870 struct lov_layout_entry *entry;
872 lov_foreach_layout_entry(lov, entry)
873 if (entry->lle_comp_ops)
874 entry->lle_comp_ops->lco_fini(env, entry);
876 OBD_FREE_PTR_ARRAY(comp->lo_entries, comp->lo_entry_count);
877 comp->lo_entries = NULL;
880 if (comp->lo_mirrors != NULL) {
881 OBD_FREE_PTR_ARRAY(comp->lo_mirrors, comp->lo_mirror_count);
882 comp->lo_mirrors = NULL;
885 memset(comp, 0, sizeof(*comp));
887 dump_lsm(D_INODE, lov->lo_lsm);
888 lov_free_memmd(&lov->lo_lsm);
893 static void lov_fini_released(const struct lu_env *env, struct lov_object *lov,
894 union lov_layout_state *state)
897 dump_lsm(D_INODE, lov->lo_lsm);
898 lov_free_memmd(&lov->lo_lsm);
902 static int lov_print_empty(const struct lu_env *env, void *cookie,
903 lu_printer_t p, const struct lu_object *o)
905 (*p)(env, cookie, "empty %d\n", lu2lov(o)->lo_layout_invalid);
909 static int lov_print_composite(const struct lu_env *env, void *cookie,
910 lu_printer_t p, const struct lu_object *o)
912 struct lov_object *lov = lu2lov(o);
913 struct lov_stripe_md *lsm = lov->lo_lsm;
916 (*p)(env, cookie, "entries: %d, %s, lsm{%p 0x%08X %d %u}:\n",
917 lsm->lsm_entry_count,
918 lov->lo_layout_invalid ? "invalid" : "valid", lsm,
919 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
920 lsm->lsm_layout_gen);
922 for (i = 0; i < lsm->lsm_entry_count; i++) {
923 struct lov_stripe_md_entry *lse = lsm->lsm_entries[i];
924 struct lov_layout_entry *lle = lov_entry(lov, i);
927 DEXT ": { 0x%08X, %u, %#x, %u, %#x, %u, %u }\n",
928 PEXT(&lse->lsme_extent), lse->lsme_magic,
929 lse->lsme_id, lse->lsme_pattern, lse->lsme_layout_gen,
930 lse->lsme_flags, lse->lsme_stripe_count,
931 lse->lsme_stripe_size);
932 lov_print_raid0(env, cookie, p, lle);
938 static int lov_print_released(const struct lu_env *env, void *cookie,
939 lu_printer_t p, const struct lu_object *o)
941 struct lov_object *lov = lu2lov(o);
942 struct lov_stripe_md *lsm = lov->lo_lsm;
945 "released: %s, lsm{%p 0x%08X %d %u}:\n",
946 lov->lo_layout_invalid ? "invalid" : "valid", lsm,
947 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
948 lsm->lsm_layout_gen);
952 static int lov_print_foreign(const struct lu_env *env, void *cookie,
953 lu_printer_t p, const struct lu_object *o)
955 struct lov_object *lov = lu2lov(o);
956 struct lov_stripe_md *lsm = lov->lo_lsm;
959 "foreign: %s, lsm{%p 0x%08X %d %u}:\n",
960 lov->lo_layout_invalid ? "invalid" : "valid", lsm,
961 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
962 lsm->lsm_layout_gen);
964 "raw_ea_content '%.*s'\n",
965 (int)lsm->lsm_foreign_size, (char *)lsm_foreign(lsm));
970 * Implements cl_object_operations::coo_attr_get() method for an object
971 * without stripes (LLT_EMPTY layout type).
973 * The only attributes this layer is authoritative in this case is
974 * cl_attr::cat_blocks---it's 0.
976 static int lov_attr_get_empty(const struct lu_env *env, struct cl_object *obj,
977 struct cl_attr *attr)
979 attr->cat_blocks = 0;
983 static int lov_attr_get_composite(const struct lu_env *env,
984 struct cl_object *obj,
985 struct cl_attr *attr)
987 struct lov_object *lov = cl2lov(obj);
988 struct lov_layout_entry *entry;
994 attr->cat_blocks = 0;
995 lov_foreach_layout_entry(lov, entry) {
996 struct cl_attr *lov_attr = NULL;
997 int index = lov_layout_entry_index(lov, entry);
999 if (!entry->lle_valid)
1002 /* PFL: This component has not been init-ed. */
1003 if (!lsm_entry_inited(lov->lo_lsm, index))
1006 result = entry->lle_comp_ops->lco_getattr(env, lov, index,
1011 if (lov_attr == NULL)
1014 CDEBUG(D_INODE, "COMP ID #%i: s=%llu m=%llu a=%llu c=%llu "
1015 "b=%llu\n", index - 1, lov_attr->cat_size,
1016 lov_attr->cat_mtime, lov_attr->cat_atime,
1017 lov_attr->cat_ctime, lov_attr->cat_blocks);
1020 attr->cat_blocks += lov_attr->cat_blocks;
1021 if (attr->cat_size < lov_attr->cat_size)
1022 attr->cat_size = lov_attr->cat_size;
1023 if (attr->cat_kms < lov_attr->cat_kms)
1024 attr->cat_kms = lov_attr->cat_kms;
1025 if (attr->cat_atime < lov_attr->cat_atime)
1026 attr->cat_atime = lov_attr->cat_atime;
1027 if (attr->cat_ctime < lov_attr->cat_ctime)
1028 attr->cat_ctime = lov_attr->cat_ctime;
1029 if (attr->cat_mtime < lov_attr->cat_mtime)
1030 attr->cat_mtime = lov_attr->cat_mtime;
1036 static int lov_flush_composite(const struct lu_env *env,
1037 struct cl_object *obj,
1038 struct ldlm_lock *lock)
1040 struct lov_object *lov = cl2lov(obj);
1041 struct lov_layout_entry *lle;
1046 lov_foreach_layout_entry(lov, lle) {
1047 if (!lsme_is_dom(lle->lle_lsme))
1049 rc = cl_object_flush(env, lovsub2cl(lle->lle_dom.lo_dom), lock);
1056 static int lov_flush_empty(const struct lu_env *env, struct cl_object *obj,
1057 struct ldlm_lock *lock)
1062 const static struct lov_layout_operations lov_dispatch[] = {
1064 .llo_init = lov_init_empty,
1065 .llo_delete = lov_delete_empty,
1066 .llo_fini = lov_fini_empty,
1067 .llo_print = lov_print_empty,
1068 .llo_page_init = lov_page_init_empty,
1069 .llo_lock_init = lov_lock_init_empty,
1070 .llo_io_init = lov_io_init_empty,
1071 .llo_getattr = lov_attr_get_empty,
1072 .llo_flush = lov_flush_empty,
1075 .llo_init = lov_init_released,
1076 .llo_delete = lov_delete_empty,
1077 .llo_fini = lov_fini_released,
1078 .llo_print = lov_print_released,
1079 .llo_page_init = lov_page_init_empty,
1080 .llo_lock_init = lov_lock_init_empty,
1081 .llo_io_init = lov_io_init_released,
1082 .llo_getattr = lov_attr_get_empty,
1083 .llo_flush = lov_flush_empty,
1086 .llo_init = lov_init_composite,
1087 .llo_delete = lov_delete_composite,
1088 .llo_fini = lov_fini_composite,
1089 .llo_print = lov_print_composite,
1090 .llo_page_init = lov_page_init_composite,
1091 .llo_lock_init = lov_lock_init_composite,
1092 .llo_io_init = lov_io_init_composite,
1093 .llo_getattr = lov_attr_get_composite,
1094 .llo_flush = lov_flush_composite,
1097 .llo_init = lov_init_foreign,
1098 .llo_delete = lov_delete_empty,
1099 .llo_fini = lov_fini_released,
1100 .llo_print = lov_print_foreign,
1101 .llo_page_init = lov_page_init_foreign,
1102 .llo_lock_init = lov_lock_init_empty,
1103 .llo_io_init = lov_io_init_empty,
1104 .llo_getattr = lov_attr_get_empty,
1105 .llo_flush = lov_flush_empty,
1110 * Performs a double-dispatch based on the layout type of an object.
1112 #define LOV_2DISPATCH_NOLOCK(obj, op, ...) \
1114 struct lov_object *__obj = (obj); \
1115 enum lov_layout_type __llt; \
1117 __llt = __obj->lo_type; \
1118 LASSERT(__llt < ARRAY_SIZE(lov_dispatch)); \
1119 lov_dispatch[__llt].op(__VA_ARGS__); \
1123 * Return lov_layout_type associated with a given lsm
1125 static enum lov_layout_type lov_type(struct lov_stripe_md *lsm)
1130 if (lsm->lsm_is_released)
1131 return LLT_RELEASED;
1133 if (lsm->lsm_magic == LOV_MAGIC_V1 ||
1134 lsm->lsm_magic == LOV_MAGIC_V3 ||
1135 lsm->lsm_magic == LOV_MAGIC_COMP_V1)
1138 if (lsm->lsm_magic == LOV_MAGIC_FOREIGN)
1144 static inline void lov_conf_freeze(struct lov_object *lov)
1146 CDEBUG(D_INODE, "To take share lov(%p) owner %p/%p\n",
1147 lov, lov->lo_owner, current);
1148 if (lov->lo_owner != current)
1149 down_read(&lov->lo_type_guard);
1152 static inline void lov_conf_thaw(struct lov_object *lov)
1154 CDEBUG(D_INODE, "To release share lov(%p) owner %p/%p\n",
1155 lov, lov->lo_owner, current);
1156 if (lov->lo_owner != current)
1157 up_read(&lov->lo_type_guard);
1160 #define LOV_2DISPATCH_MAYLOCK(obj, op, lock, ...) \
1162 struct lov_object *__obj = (obj); \
1163 int __lock = !!(lock); \
1164 typeof(lov_dispatch[0].op(__VA_ARGS__)) __result; \
1167 lov_conf_freeze(__obj); \
1168 __result = LOV_2DISPATCH_NOLOCK(obj, op, __VA_ARGS__); \
1170 lov_conf_thaw(__obj); \
1175 * Performs a locked double-dispatch based on the layout type of an object.
1177 #define LOV_2DISPATCH(obj, op, ...) \
1178 LOV_2DISPATCH_MAYLOCK(obj, op, 1, __VA_ARGS__)
1180 #define LOV_2DISPATCH_VOID(obj, op, ...) \
1182 struct lov_object *__obj = (obj); \
1183 enum lov_layout_type __llt; \
1185 lov_conf_freeze(__obj); \
1186 __llt = __obj->lo_type; \
1187 LASSERT(__llt < ARRAY_SIZE(lov_dispatch)); \
1188 lov_dispatch[__llt].op(__VA_ARGS__); \
1189 lov_conf_thaw(__obj); \
1192 static void lov_conf_lock(struct lov_object *lov)
1194 LASSERT(lov->lo_owner != current);
1195 down_write(&lov->lo_type_guard);
1196 LASSERT(lov->lo_owner == NULL);
1197 lov->lo_owner = current;
1198 CDEBUG(D_INODE, "Took exclusive lov(%p) owner %p\n",
1199 lov, lov->lo_owner);
1202 static void lov_conf_unlock(struct lov_object *lov)
1204 CDEBUG(D_INODE, "To release exclusive lov(%p) owner %p\n",
1205 lov, lov->lo_owner);
1206 lov->lo_owner = NULL;
1207 up_write(&lov->lo_type_guard);
1210 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov)
1214 while (atomic_read(&lov->lo_active_ios) > 0) {
1215 CDEBUG(D_INODE, "file:"DFID" wait for active IO, now: %d.\n",
1216 PFID(lu_object_fid(lov2lu(lov))),
1217 atomic_read(&lov->lo_active_ios));
1219 wait_event_idle(lov->lo_waitq,
1220 atomic_read(&lov->lo_active_ios) == 0);
1225 static int lov_layout_change(const struct lu_env *unused,
1226 struct lov_object *lov, struct lov_stripe_md *lsm,
1227 const struct cl_object_conf *conf)
1229 enum lov_layout_type llt = lov_type(lsm);
1230 union lov_layout_state *state = &lov->u;
1231 const struct lov_layout_operations *old_ops;
1232 const struct lov_layout_operations *new_ops;
1233 struct lov_device *lov_dev = lov_object_dev(lov);
1239 LASSERT(lov->lo_type < ARRAY_SIZE(lov_dispatch));
1241 env = cl_env_get(&refcheck);
1243 RETURN(PTR_ERR(env));
1245 LASSERT(llt < ARRAY_SIZE(lov_dispatch));
1247 CDEBUG(D_INODE, DFID" from %s to %s\n",
1248 PFID(lu_object_fid(lov2lu(lov))),
1249 llt2str(lov->lo_type), llt2str(llt));
1251 old_ops = &lov_dispatch[lov->lo_type];
1252 new_ops = &lov_dispatch[llt];
1254 rc = cl_object_prune(env, &lov->lo_cl);
1258 rc = old_ops->llo_delete(env, lov, &lov->u);
1262 old_ops->llo_fini(env, lov, &lov->u);
1264 LASSERT(atomic_read(&lov->lo_active_ios) == 0);
1266 CDEBUG(D_INODE, DFID "Apply new layout lov %p, type %d\n",
1267 PFID(lu_object_fid(lov2lu(lov))), lov, llt);
1269 /* page bufsize fixup */
1270 cl_object_header(&lov->lo_cl)->coh_page_bufsize -=
1271 lov_page_slice_fixup(lov, NULL);
1274 rc = new_ops->llo_init(env, lov_dev, lov, lsm, conf, state);
1276 struct obd_device *obd = lov2obd(lov_dev->ld_lov);
1278 CERROR("%s: cannot apply new layout on "DFID" : rc = %d\n",
1279 obd->obd_name, PFID(lu_object_fid(lov2lu(lov))), rc);
1280 new_ops->llo_delete(env, lov, state);
1281 new_ops->llo_fini(env, lov, state);
1282 /* this file becomes an EMPTY file. */
1283 lov->lo_type = LLT_EMPTY;
1288 cl_env_put(env, &refcheck);
1292 /*****************************************************************************
1294 * Lov object operations.
1297 static int lov_object_init(const struct lu_env *env, struct lu_object *obj,
1298 const struct lu_object_conf *conf)
1300 struct lov_object *lov = lu2lov(obj);
1301 struct lov_device *dev = lov_object_dev(lov);
1302 const struct cl_object_conf *cconf = lu2cl_conf(conf);
1303 union lov_layout_state *set = &lov->u;
1304 const struct lov_layout_operations *ops;
1305 struct lov_stripe_md *lsm = NULL;
1309 init_rwsem(&lov->lo_type_guard);
1310 atomic_set(&lov->lo_active_ios, 0);
1311 init_waitqueue_head(&lov->lo_waitq);
1312 cl_object_page_init(lu2cl(obj), sizeof(struct lov_page));
1314 lov->lo_type = LLT_EMPTY;
1315 if (cconf->u.coc_layout.lb_buf != NULL) {
1316 lsm = lov_unpackmd(dev->ld_lov,
1317 cconf->u.coc_layout.lb_buf,
1318 cconf->u.coc_layout.lb_len);
1320 RETURN(PTR_ERR(lsm));
1322 dump_lsm(D_INODE, lsm);
1325 /* no locking is necessary, as object is being created */
1326 lov->lo_type = lov_type(lsm);
1327 ops = &lov_dispatch[lov->lo_type];
1328 rc = ops->llo_init(env, dev, lov, lsm, cconf, set);
1338 static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
1339 const struct cl_object_conf *conf)
1341 struct lov_stripe_md *lsm = NULL;
1342 struct lov_object *lov = cl2lov(obj);
1346 if (conf->coc_opc == OBJECT_CONF_SET &&
1347 conf->u.coc_layout.lb_buf != NULL) {
1348 lsm = lov_unpackmd(lov_object_dev(lov)->ld_lov,
1349 conf->u.coc_layout.lb_buf,
1350 conf->u.coc_layout.lb_len);
1352 RETURN(PTR_ERR(lsm));
1353 dump_lsm(D_INODE, lsm);
1357 if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
1358 lov->lo_layout_invalid = true;
1359 GOTO(out, result = 0);
1362 if (conf->coc_opc == OBJECT_CONF_WAIT) {
1363 if (lov->lo_layout_invalid &&
1364 atomic_read(&lov->lo_active_ios) > 0) {
1365 lov_conf_unlock(lov);
1366 result = lov_layout_wait(env, lov);
1372 LASSERT(conf->coc_opc == OBJECT_CONF_SET);
1374 if ((lsm == NULL && lov->lo_lsm == NULL) ||
1375 ((lsm != NULL && lov->lo_lsm != NULL) &&
1376 (lov->lo_lsm->lsm_layout_gen == lsm->lsm_layout_gen) &&
1377 (lov->lo_lsm->lsm_entries[0]->lsme_pattern ==
1378 lsm->lsm_entries[0]->lsme_pattern))) {
1379 /* same version of layout */
1380 lov->lo_layout_invalid = false;
1381 GOTO(out, result = 0);
1384 /* will change layout - check if there still exists active IO. */
1385 if (atomic_read(&lov->lo_active_ios) > 0) {
1386 lov->lo_layout_invalid = true;
1387 GOTO(out, result = -EBUSY);
1390 result = lov_layout_change(env, lov, lsm, conf);
1391 lov->lo_layout_invalid = result != 0;
1395 lov_conf_unlock(lov);
1397 CDEBUG(D_INODE, DFID" lo_layout_invalid=%d\n",
1398 PFID(lu_object_fid(lov2lu(lov))), lov->lo_layout_invalid);
1402 static void lov_object_delete(const struct lu_env *env, struct lu_object *obj)
1404 struct lov_object *lov = lu2lov(obj);
1407 LOV_2DISPATCH_VOID(lov, llo_delete, env, lov, &lov->u);
1411 static void lov_object_free(const struct lu_env *env, struct lu_object *obj)
1413 struct lov_object *lov = lu2lov(obj);
1416 LOV_2DISPATCH_VOID(lov, llo_fini, env, lov, &lov->u);
1417 lu_object_fini(obj);
1418 OBD_SLAB_FREE_PTR(lov, lov_object_kmem);
1422 static int lov_object_print(const struct lu_env *env, void *cookie,
1423 lu_printer_t p, const struct lu_object *o)
1425 return LOV_2DISPATCH_NOLOCK(lu2lov(o), llo_print, env, cookie, p, o);
1428 static int lov_page_init(const struct lu_env *env, struct cl_object *obj,
1429 struct cl_page *page, pgoff_t index)
1431 return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_page_init, env, obj, page,
1436 * Implements cl_object_operations::clo_io_init() method for lov
1437 * layer. Dispatches to the appropriate layout io initialization method.
1439 static int lov_io_init(const struct lu_env *env, struct cl_object *obj,
1442 CL_IO_SLICE_CLEAN(lov_env_io(env), lis_preserved);
1444 CDEBUG(D_INODE, DFID "io %p type %d ignore/verify layout %d/%d\n",
1445 PFID(lu_object_fid(&obj->co_lu)), io, io->ci_type,
1446 io->ci_ignore_layout, io->ci_verify_layout);
1448 /* IO type CIT_MISC with ci_ignore_layout set are usually invoked from
1449 * the OSC layer. It shouldn't take lov layout conf lock in that case,
1450 * because as long as the OSC object exists, the layout can't be
1452 return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_io_init,
1453 !(io->ci_ignore_layout && io->ci_type == CIT_MISC),
1458 * An implementation of cl_object_operations::clo_attr_get() method for lov
1459 * layer. For raid0 layout this collects and merges attributes of all
1462 static int lov_attr_get(const struct lu_env *env, struct cl_object *obj,
1463 struct cl_attr *attr)
1465 /* do not take lock, as this function is called under a
1466 * spin-lock. Layout is protected from changing by ongoing IO. */
1467 return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_getattr, env, obj, attr);
1470 static int lov_attr_update(const struct lu_env *env, struct cl_object *obj,
1471 const struct cl_attr *attr, unsigned valid)
1474 * No dispatch is required here, as no layout implements this.
1479 static int lov_lock_init(const struct lu_env *env, struct cl_object *obj,
1480 struct cl_lock *lock, const struct cl_io *io)
1482 /* No need to lock because we've taken one refcount of layout. */
1483 return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_lock_init, env, obj, lock,
1488 * We calculate on which OST the mapping will end. If the length of mapping
1489 * is greater than (stripe_size * stripe_count) then the last_stripe will
1490 * will be one just before start_stripe. Else we check if the mapping
1491 * intersects each OST and find last_stripe.
1492 * This function returns the last_stripe and also sets the stripe_count
1493 * over which the mapping is spread
1495 * \param lsm [in] striping information for the file
1496 * \param index [in] stripe component index
1497 * \param ext [in] logical extent of mapping
1498 * \param start_stripe [in] starting stripe of the mapping
1499 * \param stripe_count [out] the number of stripes across which to map is
1502 * \retval last_stripe return the last stripe of the mapping
1504 static int fiemap_calc_last_stripe(struct lov_stripe_md *lsm, int index,
1505 struct lu_extent *ext,
1506 int start_stripe, int *stripe_count)
1508 struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1514 if (ext->e_end - ext->e_start >
1515 lsme->lsme_stripe_size * lsme->lsme_stripe_count) {
1516 last_stripe = (start_stripe < 1 ? lsme->lsme_stripe_count - 1 :
1518 *stripe_count = lsme->lsme_stripe_count;
1520 for (j = 0, i = start_stripe; j < lsme->lsme_stripe_count;
1521 i = (i + 1) % lsme->lsme_stripe_count, j++) {
1522 if ((lov_stripe_intersects(lsm, index, i, ext,
1523 &obd_start, &obd_end)) == 0)
1527 last_stripe = (start_stripe + j - 1) % lsme->lsme_stripe_count;
1534 * Set fe_device and copy extents from local buffer into main return buffer.
1536 * \param fiemap [out] fiemap to hold all extents
1537 * \param lcl_fm_ext [in] array of fiemap extents get from OSC layer
1538 * \param ost_index [in] OST index to be written into the fm_device
1539 * field for each extent
1540 * \param ext_count [in] number of extents to be copied
1541 * \param current_extent [in] where to start copying in the extent array
1543 static void fiemap_prepare_and_copy_exts(struct fiemap *fiemap,
1544 struct fiemap_extent *lcl_fm_ext,
1545 int ost_index, unsigned int ext_count,
1551 for (ext = 0; ext < ext_count; ext++) {
1552 lcl_fm_ext[ext].fe_device = ost_index;
1553 lcl_fm_ext[ext].fe_flags |= FIEMAP_EXTENT_NET;
1556 /* Copy fm_extent's from fm_local to return buffer */
1557 to = (char *)fiemap + fiemap_count_to_size(current_extent);
1558 memcpy(to, lcl_fm_ext, ext_count * sizeof(struct fiemap_extent));
1561 #define FIEMAP_BUFFER_SIZE 4096
1564 * Non-zero fe_logical indicates that this is a continuation FIEMAP
1565 * call. The local end offset and the device are sent in the first
1566 * fm_extent. This function calculates the stripe number from the index.
1567 * This function returns a stripe_no on which mapping is to be restarted.
1569 * This function returns fm_end_offset which is the in-OST offset at which
1570 * mapping should be restarted. If fm_end_offset=0 is returned then caller
1571 * will re-calculate proper offset in next stripe.
1572 * Note that the first extent is passed to lov_get_info via the value field.
1574 * \param fiemap [in] fiemap request header
1575 * \param lsm [in] striping information for the file
1576 * \param index [in] stripe component index
1577 * \param ext [in] logical extent of mapping
1578 * \param start_stripe [out] starting stripe will be returned in this
1580 static u64 fiemap_calc_fm_end_offset(struct fiemap *fiemap,
1581 struct lov_stripe_md *lsm,
1582 int index, struct lu_extent *ext,
1585 struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1586 u64 local_end = fiemap->fm_extents[0].fe_logical;
1593 if (fiemap->fm_extent_count == 0 ||
1594 fiemap->fm_extents[0].fe_logical == 0)
1597 /* Find out stripe_no from ost_index saved in the fe_device */
1598 for (i = 0; i < lsme->lsme_stripe_count; i++) {
1599 struct lov_oinfo *oinfo = lsme->lsme_oinfo[i];
1601 if (lov_oinfo_is_dummy(oinfo))
1604 if (oinfo->loi_ost_idx == fiemap->fm_extents[0].fe_device) {
1610 if (stripe_no == -1)
1613 /* If we have finished mapping on previous device, shift logical
1614 * offset to start of next device */
1615 if (lov_stripe_intersects(lsm, index, stripe_no, ext,
1616 &lun_start, &lun_end) != 0 &&
1617 local_end < lun_end) {
1618 fm_end_offset = local_end;
1619 *start_stripe = stripe_no;
1621 /* This is a special value to indicate that caller should
1622 * calculate offset in next stripe. */
1624 *start_stripe = (stripe_no + 1) % lsme->lsme_stripe_count;
1627 return fm_end_offset;
1630 struct fiemap_state {
1631 struct fiemap *fs_fm;
1632 struct lu_extent fs_ext;
1637 int fs_start_stripe;
1639 bool fs_device_done;
1640 bool fs_finish_stripe;
1644 static struct cl_object *lov_find_subobj(const struct lu_env *env,
1645 struct lov_object *lov,
1646 struct lov_stripe_md *lsm,
1649 struct lov_device *dev = lu2lov_dev(lov2lu(lov)->lo_dev);
1650 struct lov_thread_info *lti = lov_env_info(env);
1651 struct lu_fid *ofid = <i->lti_fid;
1652 struct lov_oinfo *oinfo;
1653 struct cl_device *subdev;
1654 int entry = lov_comp_entry(index);
1655 int stripe = lov_comp_stripe(index);
1658 struct cl_object *result;
1660 if (lov->lo_type != LLT_COMP)
1661 GOTO(out, result = NULL);
1663 if (entry >= lsm->lsm_entry_count ||
1664 stripe >= lsm->lsm_entries[entry]->lsme_stripe_count)
1665 GOTO(out, result = NULL);
1667 oinfo = lsm->lsm_entries[entry]->lsme_oinfo[stripe];
1668 ost_idx = oinfo->loi_ost_idx;
1669 rc = ostid_to_fid(ofid, &oinfo->loi_oi, ost_idx);
1671 GOTO(out, result = NULL);
1673 subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
1674 result = lov_sub_find(env, subdev, ofid, NULL);
1677 result = ERR_PTR(-EINVAL);
1681 static int fiemap_for_stripe(const struct lu_env *env, struct cl_object *obj,
1682 struct lov_stripe_md *lsm, struct fiemap *fiemap,
1683 size_t *buflen, struct ll_fiemap_info_key *fmkey,
1684 int index, int stripeno, struct fiemap_state *fs)
1686 struct lov_stripe_md_entry *lsme = lsm->lsm_entries[index];
1687 struct cl_object *subobj;
1688 struct lov_obd *lov = lu2lov_dev(obj->co_lu.lo_dev)->ld_lov;
1689 struct fiemap_extent *fm_ext = &fs->fs_fm->fm_extents[0];
1690 u64 req_fm_len; /* Stores length of required mapping */
1691 u64 len_mapped_single_call;
1695 unsigned int ext_count;
1696 /* EOF for object */
1697 bool ost_eof = false;
1698 /* done with required mapping for this OST? */
1699 bool ost_done = false;
1703 fs->fs_device_done = false;
1704 /* Find out range of mapping on this stripe */
1705 if ((lov_stripe_intersects(lsm, index, stripeno, &fs->fs_ext,
1706 &lun_start, &obd_object_end)) == 0)
1709 if (lov_oinfo_is_dummy(lsme->lsme_oinfo[stripeno]))
1712 /* If this is a continuation FIEMAP call and we are on
1713 * starting stripe then lun_start needs to be set to
1715 if (fs->fs_end_offset != 0 && stripeno == fs->fs_start_stripe)
1716 lun_start = fs->fs_end_offset;
1717 lun_end = lov_size_to_stripe(lsm, index, fs->fs_ext.e_end, stripeno);
1718 if (lun_start == lun_end)
1721 req_fm_len = obd_object_end - lun_start + 1;
1722 fs->fs_fm->fm_length = 0;
1723 len_mapped_single_call = 0;
1725 /* find lobsub object */
1726 subobj = lov_find_subobj(env, cl2lov(obj), lsm,
1727 lov_comp_index(index, stripeno));
1729 return PTR_ERR(subobj);
1730 /* If the output buffer is very large and the objects have many
1731 * extents we may need to loop on a single OST repeatedly */
1733 if (fiemap->fm_extent_count > 0) {
1734 /* Don't get too many extents. */
1735 if (fs->fs_cur_extent + fs->fs_cnt_need >
1736 fiemap->fm_extent_count)
1737 fs->fs_cnt_need = fiemap->fm_extent_count -
1741 lun_start += len_mapped_single_call;
1742 fs->fs_fm->fm_length = req_fm_len - len_mapped_single_call;
1743 req_fm_len = fs->fs_fm->fm_length;
1745 * If we've collected enough extent map, we'd request 1 more,
1746 * to see whether we coincidentally finished all available
1747 * extent map, so that FIEMAP_EXTENT_LAST would be set.
1749 fs->fs_fm->fm_extent_count = fs->fs_enough ?
1750 1 : fs->fs_cnt_need;
1751 fs->fs_fm->fm_mapped_extents = 0;
1752 fs->fs_fm->fm_flags = fiemap->fm_flags;
1754 ost_index = lsme->lsme_oinfo[stripeno]->loi_ost_idx;
1756 if (ost_index < 0 || ost_index >= lov->desc.ld_tgt_count)
1757 GOTO(obj_put, rc = -EINVAL);
1758 /* If OST is inactive, return extent with UNKNOWN flag. */
1759 if (!lov->lov_tgts[ost_index]->ltd_active) {
1760 fs->fs_fm->fm_flags |= FIEMAP_EXTENT_LAST;
1761 fs->fs_fm->fm_mapped_extents = 1;
1763 fm_ext[0].fe_logical = lun_start;
1764 fm_ext[0].fe_length = obd_object_end - lun_start + 1;
1765 fm_ext[0].fe_flags |= FIEMAP_EXTENT_UNKNOWN;
1770 fs->fs_fm->fm_start = lun_start;
1771 fs->fs_fm->fm_flags &= ~FIEMAP_FLAG_DEVICE_ORDER;
1772 memcpy(&fmkey->lfik_fiemap, fs->fs_fm, sizeof(*fs->fs_fm));
1773 *buflen = fiemap_count_to_size(fs->fs_fm->fm_extent_count);
1775 rc = cl_object_fiemap(env, subobj, fmkey, fs->fs_fm, buflen);
1779 ext_count = fs->fs_fm->fm_mapped_extents;
1780 if (ext_count == 0) {
1782 fs->fs_device_done = true;
1783 /* If last stripe has hold at the end,
1784 * we need to return */
1785 if (stripeno == fs->fs_last_stripe) {
1786 fiemap->fm_mapped_extents = 0;
1787 fs->fs_finish_stripe = true;
1791 } else if (fs->fs_enough) {
1793 * We've collected enough extents and there are
1794 * more extents after it.
1799 /* If we just need num of extents, got to next device */
1800 if (fiemap->fm_extent_count == 0) {
1801 fs->fs_cur_extent += ext_count;
1805 /* prepare to copy retrived map extents */
1806 len_mapped_single_call = fm_ext[ext_count - 1].fe_logical +
1807 fm_ext[ext_count - 1].fe_length -
1810 /* Have we finished mapping on this device? */
1811 if (req_fm_len <= len_mapped_single_call) {
1813 fs->fs_device_done = true;
1816 /* Clear the EXTENT_LAST flag which can be present on
1817 * the last extent */
1818 if (fm_ext[ext_count - 1].fe_flags & FIEMAP_EXTENT_LAST)
1819 fm_ext[ext_count - 1].fe_flags &= ~FIEMAP_EXTENT_LAST;
1820 if (lov_stripe_size(lsm, index,
1821 fm_ext[ext_count - 1].fe_logical +
1822 fm_ext[ext_count - 1].fe_length,
1823 stripeno) >= fmkey->lfik_oa.o_size) {
1825 fs->fs_device_done = true;
1828 fiemap_prepare_and_copy_exts(fiemap, fm_ext, ost_index,
1829 ext_count, fs->fs_cur_extent);
1830 fs->fs_cur_extent += ext_count;
1832 /* Ran out of available extents? */
1833 if (fs->fs_cur_extent >= fiemap->fm_extent_count)
1834 fs->fs_enough = true;
1835 } while (!ost_done && !ost_eof);
1837 if (stripeno == fs->fs_last_stripe)
1838 fs->fs_finish_stripe = true;
1840 cl_object_put(env, subobj);
1846 * Break down the FIEMAP request and send appropriate calls to individual OSTs.
1847 * This also handles the restarting of FIEMAP calls in case mapping overflows
1848 * the available number of extents in single call.
1850 * \param env [in] lustre environment
1851 * \param obj [in] file object
1852 * \param fmkey [in] fiemap request header and other info
1853 * \param fiemap [out] fiemap buffer holding retrived map extents
1854 * \param buflen [in/out] max buffer length of @fiemap, when iterate
1855 * each OST, it is used to limit max map needed
1859 static int lov_object_fiemap(const struct lu_env *env, struct cl_object *obj,
1860 struct ll_fiemap_info_key *fmkey,
1861 struct fiemap *fiemap, size_t *buflen)
1863 struct lov_stripe_md_entry *lsme;
1864 struct lov_stripe_md *lsm;
1865 struct fiemap *fm_local = NULL;
1873 unsigned int buffer_size = FIEMAP_BUFFER_SIZE;
1875 struct fiemap_state fs = { 0 };
1878 lsm = lov_lsm_addref(cl2lov(obj));
1880 /* no extent: there is no object for mapping */
1881 fiemap->fm_mapped_extents = 0;
1885 if (!(fiemap->fm_flags & FIEMAP_FLAG_DEVICE_ORDER)) {
1887 * If the entry count > 1 or stripe_count > 1 and the
1888 * application does not understand DEVICE_ORDER flag,
1889 * it cannot interpret the extents correctly.
1891 if (lsm->lsm_entry_count > 1 ||
1892 (lsm->lsm_entry_count == 1 &&
1893 lsm->lsm_entries[0]->lsme_stripe_count > 1))
1894 GOTO(out_lsm, rc = -ENOTSUPP);
1897 /* No support for DOM layout yet. */
1898 if (lsme_is_dom(lsm->lsm_entries[0]))
1899 GOTO(out_lsm, rc = -ENOTSUPP);
1901 if (lsm->lsm_is_released) {
1902 if (fiemap->fm_start < fmkey->lfik_oa.o_size) {
1904 * released file, return a minimal FIEMAP if
1905 * request fits in file-size.
1907 fiemap->fm_mapped_extents = 1;
1908 fiemap->fm_extents[0].fe_logical = fiemap->fm_start;
1909 if (fiemap->fm_start + fiemap->fm_length <
1910 fmkey->lfik_oa.o_size)
1911 fiemap->fm_extents[0].fe_length =
1914 fiemap->fm_extents[0].fe_length =
1915 fmkey->lfik_oa.o_size -
1917 fiemap->fm_extents[0].fe_flags |=
1918 FIEMAP_EXTENT_UNKNOWN | FIEMAP_EXTENT_LAST;
1920 GOTO(out_lsm, rc = 0);
1923 /* buffer_size is small to hold fm_extent_count of extents. */
1924 if (fiemap_count_to_size(fiemap->fm_extent_count) < buffer_size)
1925 buffer_size = fiemap_count_to_size(fiemap->fm_extent_count);
1927 OBD_ALLOC_LARGE(fm_local, buffer_size);
1928 if (fm_local == NULL)
1929 GOTO(out_lsm, rc = -ENOMEM);
1932 * Requested extent count exceeds the fiemap buffer size, shrink our
1935 if (fiemap_count_to_size(fiemap->fm_extent_count) > *buflen)
1936 fiemap->fm_extent_count = fiemap_size_to_count(*buflen);
1937 if (fiemap->fm_extent_count == 0)
1940 fs.fs_enough = false;
1941 fs.fs_cur_extent = 0;
1942 fs.fs_fm = fm_local;
1943 fs.fs_cnt_need = fiemap_size_to_count(buffer_size);
1945 whole_start = fiemap->fm_start;
1946 /* whole_start is beyond the end of the file */
1947 if (whole_start > fmkey->lfik_oa.o_size)
1948 GOTO(out_fm_local, rc = -EINVAL);
1949 whole_end = (fiemap->fm_length == OBD_OBJECT_EOF) ?
1950 fmkey->lfik_oa.o_size :
1951 whole_start + fiemap->fm_length - 1;
1953 * If fiemap->fm_length != OBD_OBJECT_EOF but whole_end exceeds file
1956 if (whole_end > fmkey->lfik_oa.o_size)
1957 whole_end = fmkey->lfik_oa.o_size;
1959 start_entry = lov_lsm_entry(lsm, whole_start);
1960 end_entry = lov_lsm_entry(lsm, whole_end);
1961 if (end_entry == -1)
1962 end_entry = lsm->lsm_entry_count - 1;
1964 if (start_entry == -1 || end_entry == -1)
1965 GOTO(out_fm_local, rc = -EINVAL);
1967 /* TODO: rewrite it with lov_foreach_io_layout() */
1968 for (entry = start_entry; entry <= end_entry; entry++) {
1969 lsme = lsm->lsm_entries[entry];
1971 if (!lsme_inited(lsme))
1974 if (entry == start_entry)
1975 fs.fs_ext.e_start = whole_start;
1977 fs.fs_ext.e_start = lsme->lsme_extent.e_start;
1978 if (entry == end_entry)
1979 fs.fs_ext.e_end = whole_end;
1981 fs.fs_ext.e_end = lsme->lsme_extent.e_end - 1;
1982 fs.fs_length = fs.fs_ext.e_end - fs.fs_ext.e_start + 1;
1984 /* Calculate start stripe, last stripe and length of mapping */
1985 fs.fs_start_stripe = lov_stripe_number(lsm, entry,
1987 fs.fs_last_stripe = fiemap_calc_last_stripe(lsm, entry,
1988 &fs.fs_ext, fs.fs_start_stripe,
1990 fs.fs_end_offset = fiemap_calc_fm_end_offset(fiemap, lsm, entry,
1991 &fs.fs_ext, &fs.fs_start_stripe);
1992 /* Check each stripe */
1993 for (cur_stripe = fs.fs_start_stripe; stripe_count > 0;
1995 cur_stripe = (cur_stripe + 1) % lsme->lsme_stripe_count) {
1996 rc = fiemap_for_stripe(env, obj, lsm, fiemap, buflen,
1997 fmkey, entry, cur_stripe, &fs);
1999 GOTO(out_fm_local, rc);
2002 if (fs.fs_finish_stripe)
2004 } /* for each stripe */
2005 } /* for covering layout component */
2007 * We've traversed all components, set @entry to the last component
2008 * entry, it's for the last stripe check.
2012 /* Indicate that we are returning device offsets unless file just has
2014 if (lsm->lsm_entry_count > 1 ||
2015 (lsm->lsm_entry_count == 1 &&
2016 lsm->lsm_entries[0]->lsme_stripe_count > 1))
2017 fiemap->fm_flags |= FIEMAP_FLAG_DEVICE_ORDER;
2019 if (fiemap->fm_extent_count == 0)
2020 goto skip_last_device_calc;
2022 /* Check if we have reached the last stripe and whether mapping for that
2023 * stripe is done. */
2024 if ((cur_stripe == fs.fs_last_stripe) && fs.fs_device_done)
2025 fiemap->fm_extents[fs.fs_cur_extent - 1].fe_flags |=
2027 skip_last_device_calc:
2028 fiemap->fm_mapped_extents = fs.fs_cur_extent;
2030 OBD_FREE_LARGE(fm_local, buffer_size);
2037 static int lov_object_getstripe(const struct lu_env *env, struct cl_object *obj,
2038 struct lov_user_md __user *lum, size_t size)
2040 struct lov_object *lov = cl2lov(obj);
2041 struct lov_stripe_md *lsm;
2045 lsm = lov_lsm_addref(lov);
2049 rc = lov_getstripe(env, cl2lov(obj), lsm, lum, size);
2054 static int lov_object_layout_get(const struct lu_env *env,
2055 struct cl_object *obj,
2056 struct cl_layout *cl)
2058 struct lov_object *lov = cl2lov(obj);
2059 struct lov_stripe_md *lsm = lov_lsm_addref(lov);
2060 struct lu_buf *buf = &cl->cl_buf;
2066 cl->cl_layout_gen = CL_LAYOUT_GEN_EMPTY;
2071 cl->cl_size = lov_comp_md_size(lsm);
2072 cl->cl_layout_gen = lsm->lsm_layout_gen;
2073 cl->cl_is_released = lsm->lsm_is_released;
2074 cl->cl_is_composite = lsm_is_composite(lsm->lsm_magic);
2076 rc = lov_lsm_pack(lsm, buf->lb_buf, buf->lb_len);
2079 RETURN(rc < 0 ? rc : 0);
2082 static loff_t lov_object_maxbytes(struct cl_object *obj)
2084 struct lov_object *lov = cl2lov(obj);
2085 struct lov_stripe_md *lsm = lov_lsm_addref(lov);
2091 maxbytes = lsm->lsm_maxbytes;
2098 static int lov_object_flush(const struct lu_env *env, struct cl_object *obj,
2099 struct ldlm_lock *lock)
2101 return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_flush, true, env, obj,
2105 static const struct cl_object_operations lov_ops = {
2106 .coo_page_init = lov_page_init,
2107 .coo_lock_init = lov_lock_init,
2108 .coo_io_init = lov_io_init,
2109 .coo_attr_get = lov_attr_get,
2110 .coo_attr_update = lov_attr_update,
2111 .coo_conf_set = lov_conf_set,
2112 .coo_getstripe = lov_object_getstripe,
2113 .coo_layout_get = lov_object_layout_get,
2114 .coo_maxbytes = lov_object_maxbytes,
2115 .coo_fiemap = lov_object_fiemap,
2116 .coo_object_flush = lov_object_flush
2119 static const struct lu_object_operations lov_lu_obj_ops = {
2120 .loo_object_init = lov_object_init,
2121 .loo_object_delete = lov_object_delete,
2122 .loo_object_release = NULL,
2123 .loo_object_free = lov_object_free,
2124 .loo_object_print = lov_object_print,
2125 .loo_object_invariant = NULL,
2128 struct lu_object *lov_object_alloc(const struct lu_env *env,
2129 const struct lu_object_header *unused,
2130 struct lu_device *dev)
2132 struct lov_object *lov;
2133 struct lu_object *obj;
2136 OBD_SLAB_ALLOC_PTR_GFP(lov, lov_object_kmem, GFP_NOFS);
2139 lu_object_init(obj, NULL, dev);
2140 lov->lo_cl.co_ops = &lov_ops;
2141 lov->lo_type = -1; /* invalid, to catch uninitialized type */
2143 * object io operation vector (cl_object::co_iop) is installed
2144 * later in lov_object_init(), as different vectors are used
2145 * for object with different layouts.
2147 obj->lo_ops = &lov_lu_obj_ops;
2153 static struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov)
2155 struct lov_stripe_md *lsm = NULL;
2157 lov_conf_freeze(lov);
2158 if (lov->lo_lsm != NULL) {
2159 lsm = lsm_addref(lov->lo_lsm);
2160 CDEBUG(D_INODE, "lsm %p addref %d/%d by %p.\n",
2161 lsm, atomic_read(&lsm->lsm_refc),
2162 lov->lo_layout_invalid, current);
2168 int lov_read_and_clear_async_rc(struct cl_object *clob)
2170 struct lu_object *luobj;
2174 luobj = lu_object_locate(&cl_object_header(clob)->coh_lu,
2176 if (luobj != NULL) {
2177 struct lov_object *lov = lu2lov(luobj);
2179 lov_conf_freeze(lov);
2180 switch (lov->lo_type) {
2182 struct lov_stripe_md *lsm;
2186 LASSERT(lsm != NULL);
2187 for (i = 0; i < lsm->lsm_entry_count; i++) {
2188 struct lov_stripe_md_entry *lse =
2189 lsm->lsm_entries[i];
2192 if (!lsme_inited(lse))
2195 for (j = 0; j < lse->lsme_stripe_count; j++) {
2196 struct lov_oinfo *loi =
2199 if (lov_oinfo_is_dummy(loi))
2202 if (loi->loi_ar.ar_rc && !rc)
2203 rc = loi->loi_ar.ar_rc;
2204 loi->loi_ar.ar_rc = 0;
2220 EXPORT_SYMBOL(lov_read_and_clear_async_rc);