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27 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2011, 2013, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * Implementation of cl_object for LOV layer.
38 * Author: Nikita Danilov <nikita.danilov@sun.com>
39 * Author: Jinshan Xiong <jinshan.xiong@whamcloud.com>
42 #define DEBUG_SUBSYSTEM S_LOV
44 #include "lov_cl_internal.h"
50 /*****************************************************************************
56 struct lov_layout_operations {
57 int (*llo_init)(const struct lu_env *env, struct lov_device *dev,
58 struct lov_object *lov,
59 const struct cl_object_conf *conf,
60 union lov_layout_state *state);
61 int (*llo_delete)(const struct lu_env *env, struct lov_object *lov,
62 union lov_layout_state *state);
63 void (*llo_fini)(const struct lu_env *env, struct lov_object *lov,
64 union lov_layout_state *state);
65 void (*llo_install)(const struct lu_env *env, struct lov_object *lov,
66 union lov_layout_state *state);
67 int (*llo_print)(const struct lu_env *env, void *cookie,
68 lu_printer_t p, const struct lu_object *o);
69 int (*llo_page_init)(const struct lu_env *env, struct cl_object *obj,
70 struct cl_page *page, pgoff_t index);
71 int (*llo_lock_init)(const struct lu_env *env,
72 struct cl_object *obj, struct cl_lock *lock,
73 const struct cl_io *io);
74 int (*llo_io_init)(const struct lu_env *env,
75 struct cl_object *obj, struct cl_io *io);
76 int (*llo_getattr)(const struct lu_env *env, struct cl_object *obj,
77 struct cl_attr *attr);
80 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov);
82 struct lov_stripe_md *lov_lsm_get(struct cl_object *clobj)
84 struct lu_object *luobj;
85 struct lov_stripe_md *lsm = NULL;
90 luobj = lu_object_locate(&cl_object_header(clobj)->coh_lu,
93 lsm = lov_lsm_addref(lu2lov(luobj));
96 EXPORT_SYMBOL(lov_lsm_get);
98 void lov_lsm_put(struct cl_object *unused, struct lov_stripe_md *lsm)
101 lov_free_memmd(&lsm);
103 EXPORT_SYMBOL(lov_lsm_put);
105 /*****************************************************************************
107 * Lov object layout operations.
111 static void lov_install_empty(const struct lu_env *env,
112 struct lov_object *lov,
113 union lov_layout_state *state)
116 * File without objects.
120 static int lov_init_empty(const struct lu_env *env,
121 struct lov_device *dev, struct lov_object *lov,
122 const struct cl_object_conf *conf,
123 union lov_layout_state *state)
128 static void lov_install_raid0(const struct lu_env *env,
129 struct lov_object *lov,
130 union lov_layout_state *state)
134 static struct cl_object *lov_sub_find(const struct lu_env *env,
135 struct cl_device *dev,
136 const struct lu_fid *fid,
137 const struct cl_object_conf *conf)
142 o = lu_object_find_at(env, cl2lu_dev(dev), fid, &conf->coc_lu);
143 LASSERT(ergo(!IS_ERR(o), o->lo_dev->ld_type == &lovsub_device_type));
147 static int lov_init_sub(const struct lu_env *env, struct lov_object *lov,
148 struct cl_object *stripe, struct lov_layout_raid0 *r0,
151 struct cl_object_header *hdr;
152 struct cl_object_header *subhdr;
153 struct cl_object_header *parent;
154 struct lov_oinfo *oinfo;
157 if (OBD_FAIL_CHECK(OBD_FAIL_LOV_INIT)) {
158 /* For sanity:test_206.
159 * Do not leave the object in cache to avoid accessing
160 * freed memory. This is because osc_object is referring to
161 * lov_oinfo of lsm_stripe_data which will be freed due to
163 cl_object_kill(env, stripe);
164 cl_object_put(env, stripe);
168 hdr = cl_object_header(lov2cl(lov));
169 subhdr = cl_object_header(stripe);
171 oinfo = lov->lo_lsm->lsm_oinfo[idx];
172 CDEBUG(D_INODE, DFID"@%p[%d] -> "DFID"@%p: ostid: "DOSTID
173 " idx: %d gen: %d\n",
174 PFID(&subhdr->coh_lu.loh_fid), subhdr, idx,
175 PFID(&hdr->coh_lu.loh_fid), hdr, POSTID(&oinfo->loi_oi),
176 oinfo->loi_ost_idx, oinfo->loi_ost_gen);
178 /* reuse ->coh_attr_guard to protect coh_parent change */
179 spin_lock(&subhdr->coh_attr_guard);
180 parent = subhdr->coh_parent;
181 if (parent == NULL) {
182 subhdr->coh_parent = hdr;
183 spin_unlock(&subhdr->coh_attr_guard);
184 subhdr->coh_nesting = hdr->coh_nesting + 1;
185 lu_object_ref_add(&stripe->co_lu, "lov-parent", lov);
186 r0->lo_sub[idx] = cl2lovsub(stripe);
187 r0->lo_sub[idx]->lso_super = lov;
188 r0->lo_sub[idx]->lso_index = idx;
191 struct lu_object *old_obj;
192 struct lov_object *old_lov;
193 unsigned int mask = D_INODE;
195 spin_unlock(&subhdr->coh_attr_guard);
196 old_obj = lu_object_locate(&parent->coh_lu, &lov_device_type);
197 LASSERT(old_obj != NULL);
198 old_lov = cl2lov(lu2cl(old_obj));
199 if (old_lov->lo_layout_invalid) {
200 /* the object's layout has already changed but isn't
202 lu_object_unhash(env, &stripe->co_lu);
209 LU_OBJECT_DEBUG(mask, env, &stripe->co_lu,
210 "stripe %d is already owned.\n", idx);
211 LU_OBJECT_DEBUG(mask, env, old_obj, "owned.\n");
212 LU_OBJECT_HEADER(mask, env, lov2lu(lov), "try to own.\n");
213 cl_object_put(env, stripe);
218 static int lov_page_slice_fixup(struct lov_object *lov,
219 struct cl_object *stripe)
221 struct cl_object_header *hdr = cl_object_header(&lov->lo_cl);
225 return hdr->coh_page_bufsize - lov->lo_cl.co_slice_off -
226 cfs_size_round(sizeof(struct lov_page));
228 cl_object_for_each(o, stripe)
229 o->co_slice_off += hdr->coh_page_bufsize;
231 return cl_object_header(stripe)->coh_page_bufsize;
234 static int lov_init_raid0(const struct lu_env *env,
235 struct lov_device *dev, struct lov_object *lov,
236 const struct cl_object_conf *conf,
237 union lov_layout_state *state)
242 struct cl_object *stripe;
243 struct lov_thread_info *lti = lov_env_info(env);
244 struct cl_object_conf *subconf = <i->lti_stripe_conf;
245 struct lov_stripe_md *lsm = conf->u.coc_md->lsm;
246 struct lu_fid *ofid = <i->lti_fid;
247 struct lov_layout_raid0 *r0 = &state->raid0;
251 if (lsm->lsm_magic != LOV_MAGIC_V1 && lsm->lsm_magic != LOV_MAGIC_V3) {
252 dump_lsm(D_ERROR, lsm);
253 LASSERTF(0, "magic mismatch, expected %d/%d, actual %d.\n",
254 LOV_MAGIC_V1, LOV_MAGIC_V3, lsm->lsm_magic);
257 LASSERT(lov->lo_lsm == NULL);
258 lov->lo_lsm = lsm_addref(lsm);
259 r0->lo_nr = lsm->lsm_stripe_count;
260 LASSERT(r0->lo_nr <= lov_targets_nr(dev));
262 lov->lo_layout_invalid = true;
264 OBD_ALLOC_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
265 if (r0->lo_sub != NULL) {
269 subconf->coc_inode = conf->coc_inode;
270 spin_lock_init(&r0->lo_sub_lock);
272 * Create stripe cl_objects.
274 for (i = 0; i < r0->lo_nr && result == 0; ++i) {
275 struct cl_device *subdev;
276 struct lov_oinfo *oinfo = lsm->lsm_oinfo[i];
277 int ost_idx = oinfo->loi_ost_idx;
279 if (lov_oinfo_is_dummy(oinfo))
282 result = ostid_to_fid(ofid, &oinfo->loi_oi,
287 subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
288 subconf->u.coc_oinfo = oinfo;
289 LASSERTF(subdev != NULL, "not init ost %d\n", ost_idx);
290 /* In the function below, .hs_keycmp resolves to
291 * lu_obj_hop_keycmp() */
292 /* coverity[overrun-buffer-val] */
293 stripe = lov_sub_find(env, subdev, ofid, subconf);
294 if (!IS_ERR(stripe)) {
295 result = lov_init_sub(env, lov, stripe, r0, i);
296 if (result == -EAGAIN) { /* try again */
302 result = PTR_ERR(stripe);
306 int sz = lov_page_slice_fixup(lov, stripe);
307 LASSERT(ergo(psz > 0, psz == sz));
312 cl_object_header(&lov->lo_cl)->coh_page_bufsize += psz;
319 static int lov_init_released(const struct lu_env *env,
320 struct lov_device *dev, struct lov_object *lov,
321 const struct cl_object_conf *conf,
322 union lov_layout_state *state)
324 struct lov_stripe_md *lsm = conf->u.coc_md->lsm;
326 LASSERT(lsm != NULL);
327 LASSERT(lsm_is_released(lsm));
328 LASSERT(lov->lo_lsm == NULL);
330 lov->lo_lsm = lsm_addref(lsm);
334 static int lov_delete_empty(const struct lu_env *env, struct lov_object *lov,
335 union lov_layout_state *state)
337 LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
339 lov_layout_wait(env, lov);
343 static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
344 struct lovsub_object *los, int idx)
346 struct cl_object *sub;
347 struct lov_layout_raid0 *r0;
348 struct lu_site *site;
349 struct lu_site_bkt_data *bkt;
350 wait_queue_t *waiter;
353 LASSERT(r0->lo_sub[idx] == los);
355 sub = lovsub2cl(los);
356 site = sub->co_lu.lo_dev->ld_site;
357 bkt = lu_site_bkt_from_fid(site, &sub->co_lu.lo_header->loh_fid);
359 cl_object_kill(env, sub);
360 /* release a reference to the sub-object and ... */
361 lu_object_ref_del(&sub->co_lu, "lov-parent", lov);
362 cl_object_put(env, sub);
364 /* ... wait until it is actually destroyed---sub-object clears its
365 * ->lo_sub[] slot in lovsub_object_fini() */
366 if (r0->lo_sub[idx] == los) {
367 waiter = &lov_env_info(env)->lti_waiter;
368 init_waitqueue_entry_current(waiter);
369 add_wait_queue(&bkt->lsb_marche_funebre, waiter);
370 set_current_state(TASK_UNINTERRUPTIBLE);
372 /* this wait-queue is signaled at the end of
373 * lu_object_free(). */
374 set_current_state(TASK_UNINTERRUPTIBLE);
375 spin_lock(&r0->lo_sub_lock);
376 if (r0->lo_sub[idx] == los) {
377 spin_unlock(&r0->lo_sub_lock);
378 waitq_wait(waiter, TASK_UNINTERRUPTIBLE);
380 spin_unlock(&r0->lo_sub_lock);
381 set_current_state(TASK_RUNNING);
385 remove_wait_queue(&bkt->lsb_marche_funebre, waiter);
387 LASSERT(r0->lo_sub[idx] == NULL);
390 static int lov_delete_raid0(const struct lu_env *env, struct lov_object *lov,
391 union lov_layout_state *state)
393 struct lov_layout_raid0 *r0 = &state->raid0;
394 struct lov_stripe_md *lsm = lov->lo_lsm;
399 dump_lsm(D_INODE, lsm);
401 lov_layout_wait(env, lov);
402 if (r0->lo_sub != NULL) {
403 for (i = 0; i < r0->lo_nr; ++i) {
404 struct lovsub_object *los = r0->lo_sub[i];
407 cl_object_prune(env, &los->lso_cl);
409 * If top-level object is to be evicted from
410 * the cache, so are its sub-objects.
412 lov_subobject_kill(env, lov, los, i);
419 static void lov_fini_empty(const struct lu_env *env, struct lov_object *lov,
420 union lov_layout_state *state)
422 LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
425 static void lov_fini_raid0(const struct lu_env *env, struct lov_object *lov,
426 union lov_layout_state *state)
428 struct lov_layout_raid0 *r0 = &state->raid0;
431 if (r0->lo_sub != NULL) {
432 OBD_FREE_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
436 dump_lsm(D_INODE, lov->lo_lsm);
437 lov_free_memmd(&lov->lo_lsm);
442 static void lov_fini_released(const struct lu_env *env, struct lov_object *lov,
443 union lov_layout_state *state)
446 dump_lsm(D_INODE, lov->lo_lsm);
447 lov_free_memmd(&lov->lo_lsm);
451 static int lov_print_empty(const struct lu_env *env, void *cookie,
452 lu_printer_t p, const struct lu_object *o)
454 (*p)(env, cookie, "empty %d\n", lu2lov(o)->lo_layout_invalid);
458 static int lov_print_raid0(const struct lu_env *env, void *cookie,
459 lu_printer_t p, const struct lu_object *o)
461 struct lov_object *lov = lu2lov(o);
462 struct lov_layout_raid0 *r0 = lov_r0(lov);
463 struct lov_stripe_md *lsm = lov->lo_lsm;
466 (*p)(env, cookie, "stripes: %d, %s, lsm{%p 0x%08X %d %u %u}:\n",
467 r0->lo_nr, lov->lo_layout_invalid ? "invalid" : "valid", lsm,
468 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
469 lsm->lsm_stripe_count, lsm->lsm_layout_gen);
470 for (i = 0; i < r0->lo_nr; ++i) {
471 struct lu_object *sub;
473 if (r0->lo_sub[i] != NULL) {
474 sub = lovsub2lu(r0->lo_sub[i]);
475 lu_object_print(env, cookie, p, sub);
477 (*p)(env, cookie, "sub %d absent\n", i);
483 static int lov_print_released(const struct lu_env *env, void *cookie,
484 lu_printer_t p, const struct lu_object *o)
486 struct lov_object *lov = lu2lov(o);
487 struct lov_stripe_md *lsm = lov->lo_lsm;
490 "released: %s, lsm{%p 0x%08X %d %u %u}:\n",
491 lov->lo_layout_invalid ? "invalid" : "valid", lsm,
492 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
493 lsm->lsm_stripe_count, lsm->lsm_layout_gen);
498 * Implements cl_object_operations::coo_attr_get() method for an object
499 * without stripes (LLT_EMPTY layout type).
501 * The only attributes this layer is authoritative in this case is
502 * cl_attr::cat_blocks---it's 0.
504 static int lov_attr_get_empty(const struct lu_env *env, struct cl_object *obj,
505 struct cl_attr *attr)
507 attr->cat_blocks = 0;
511 static int lov_attr_get_raid0(const struct lu_env *env, struct cl_object *obj,
512 struct cl_attr *attr)
514 struct lov_object *lov = cl2lov(obj);
515 struct lov_layout_raid0 *r0 = lov_r0(lov);
516 struct cl_attr *lov_attr = &r0->lo_attr;
521 /* this is called w/o holding type guard mutex, so it must be inside
522 * an on going IO otherwise lsm may be replaced.
523 * LU-2117: it turns out there exists one exception. For mmaped files,
524 * the lock of those files may be requested in the other file's IO
525 * context, and this function is called in ccc_lock_state(), it will
526 * hit this assertion.
527 * Anyway, it's still okay to call attr_get w/o type guard as layout
528 * can't go if locks exist. */
529 /* LASSERT(atomic_read(&lsm->lsm_refc) > 1); */
531 if (!r0->lo_attr_valid) {
532 struct lov_stripe_md *lsm = lov->lo_lsm;
533 struct ost_lvb *lvb = &lov_env_info(env)->lti_lvb;
536 memset(lvb, 0, sizeof(*lvb));
537 /* XXX: timestamps can be negative by sanity:test_39m,
539 lvb->lvb_atime = LLONG_MIN;
540 lvb->lvb_ctime = LLONG_MIN;
541 lvb->lvb_mtime = LLONG_MIN;
544 * XXX that should be replaced with a loop over sub-objects,
545 * doing cl_object_attr_get() on them. But for now, let's
546 * reuse old lov code.
550 * XXX take lsm spin-lock to keep lov_merge_lvb_kms()
551 * happy. It's not needed, because new code uses
552 * ->coh_attr_guard spin-lock to protect consistency of
553 * sub-object attributes.
555 lov_stripe_lock(lsm);
556 result = lov_merge_lvb_kms(lsm, lvb, &kms);
557 lov_stripe_unlock(lsm);
559 cl_lvb2attr(lov_attr, lvb);
560 lov_attr->cat_kms = kms;
561 r0->lo_attr_valid = 1;
564 if (result == 0) { /* merge results */
565 attr->cat_blocks = lov_attr->cat_blocks;
566 attr->cat_size = lov_attr->cat_size;
567 attr->cat_kms = lov_attr->cat_kms;
568 if (attr->cat_atime < lov_attr->cat_atime)
569 attr->cat_atime = lov_attr->cat_atime;
570 if (attr->cat_ctime < lov_attr->cat_ctime)
571 attr->cat_ctime = lov_attr->cat_ctime;
572 if (attr->cat_mtime < lov_attr->cat_mtime)
573 attr->cat_mtime = lov_attr->cat_mtime;
578 const static struct lov_layout_operations lov_dispatch[] = {
580 .llo_init = lov_init_empty,
581 .llo_delete = lov_delete_empty,
582 .llo_fini = lov_fini_empty,
583 .llo_install = lov_install_empty,
584 .llo_print = lov_print_empty,
585 .llo_page_init = lov_page_init_empty,
586 .llo_lock_init = lov_lock_init_empty,
587 .llo_io_init = lov_io_init_empty,
588 .llo_getattr = lov_attr_get_empty
591 .llo_init = lov_init_raid0,
592 .llo_delete = lov_delete_raid0,
593 .llo_fini = lov_fini_raid0,
594 .llo_install = lov_install_raid0,
595 .llo_print = lov_print_raid0,
596 .llo_page_init = lov_page_init_raid0,
597 .llo_lock_init = lov_lock_init_raid0,
598 .llo_io_init = lov_io_init_raid0,
599 .llo_getattr = lov_attr_get_raid0
602 .llo_init = lov_init_released,
603 .llo_delete = lov_delete_empty,
604 .llo_fini = lov_fini_released,
605 .llo_install = lov_install_empty,
606 .llo_print = lov_print_released,
607 .llo_page_init = lov_page_init_empty,
608 .llo_lock_init = lov_lock_init_empty,
609 .llo_io_init = lov_io_init_released,
610 .llo_getattr = lov_attr_get_empty
615 * Performs a double-dispatch based on the layout type of an object.
617 #define LOV_2DISPATCH_NOLOCK(obj, op, ...) \
619 struct lov_object *__obj = (obj); \
620 enum lov_layout_type __llt; \
622 __llt = __obj->lo_type; \
623 LASSERT(0 <= __llt && __llt < ARRAY_SIZE(lov_dispatch)); \
624 lov_dispatch[__llt].op(__VA_ARGS__); \
628 * Return lov_layout_type associated with a given lsm
630 static enum lov_layout_type lov_type(struct lov_stripe_md *lsm)
634 if (lsm_is_released(lsm))
639 static inline void lov_conf_freeze(struct lov_object *lov)
641 if (lov->lo_owner != current)
642 down_read(&lov->lo_type_guard);
645 static inline void lov_conf_thaw(struct lov_object *lov)
647 if (lov->lo_owner != current)
648 up_read(&lov->lo_type_guard);
651 #define LOV_2DISPATCH_MAYLOCK(obj, op, lock, ...) \
653 struct lov_object *__obj = (obj); \
654 int __lock = !!(lock); \
655 typeof(lov_dispatch[0].op(__VA_ARGS__)) __result; \
658 lov_conf_freeze(__obj); \
659 __result = LOV_2DISPATCH_NOLOCK(obj, op, __VA_ARGS__); \
661 lov_conf_thaw(__obj); \
666 * Performs a locked double-dispatch based on the layout type of an object.
668 #define LOV_2DISPATCH(obj, op, ...) \
669 LOV_2DISPATCH_MAYLOCK(obj, op, 1, __VA_ARGS__)
671 #define LOV_2DISPATCH_VOID(obj, op, ...) \
673 struct lov_object *__obj = (obj); \
674 enum lov_layout_type __llt; \
676 lov_conf_freeze(__obj); \
677 __llt = __obj->lo_type; \
678 LASSERT(0 <= __llt && __llt < ARRAY_SIZE(lov_dispatch)); \
679 lov_dispatch[__llt].op(__VA_ARGS__); \
680 lov_conf_thaw(__obj); \
683 static void lov_conf_lock(struct lov_object *lov)
685 LASSERT(lov->lo_owner != current);
686 down_write(&lov->lo_type_guard);
687 LASSERT(lov->lo_owner == NULL);
688 lov->lo_owner = current;
691 static void lov_conf_unlock(struct lov_object *lov)
693 lov->lo_owner = NULL;
694 up_write(&lov->lo_type_guard);
697 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov)
699 struct l_wait_info lwi = { 0 };
702 while (atomic_read(&lov->lo_active_ios) > 0) {
703 CDEBUG(D_INODE, "file:"DFID" wait for active IO, now: %d.\n",
704 PFID(lu_object_fid(lov2lu(lov))),
705 atomic_read(&lov->lo_active_ios));
707 l_wait_event(lov->lo_waitq,
708 atomic_read(&lov->lo_active_ios) == 0, &lwi);
713 static int lov_layout_change(const struct lu_env *unused,
714 struct lov_object *lov,
715 const struct cl_object_conf *conf)
718 enum lov_layout_type llt = LLT_EMPTY;
719 union lov_layout_state *state = &lov->u;
720 const struct lov_layout_operations *old_ops;
721 const struct lov_layout_operations *new_ops;
728 LASSERT(0 <= lov->lo_type && lov->lo_type < ARRAY_SIZE(lov_dispatch));
730 if (conf->u.coc_md != NULL)
731 llt = lov_type(conf->u.coc_md->lsm);
732 LASSERT(0 <= llt && llt < ARRAY_SIZE(lov_dispatch));
734 cookie = cl_env_reenter();
735 env = cl_env_get(&refcheck);
737 cl_env_reexit(cookie);
738 RETURN(PTR_ERR(env));
741 CDEBUG(D_INODE, DFID" from %s to %s\n",
742 PFID(lu_object_fid(lov2lu(lov))),
743 llt2str(lov->lo_type), llt2str(llt));
745 old_ops = &lov_dispatch[lov->lo_type];
746 new_ops = &lov_dispatch[llt];
748 result = cl_object_prune(env, &lov->lo_cl);
752 result = old_ops->llo_delete(env, lov, &lov->u);
754 old_ops->llo_fini(env, lov, &lov->u);
756 LASSERT(atomic_read(&lov->lo_active_ios) == 0);
758 lov->lo_type = LLT_EMPTY;
759 /* page bufsize fixup */
760 cl_object_header(&lov->lo_cl)->coh_page_bufsize -=
761 lov_page_slice_fixup(lov, NULL);
763 result = new_ops->llo_init(env,
764 lu2lov_dev(lov->lo_cl.co_lu.lo_dev),
767 new_ops->llo_install(env, lov, state);
770 new_ops->llo_delete(env, lov, state);
771 new_ops->llo_fini(env, lov, state);
772 /* this file becomes an EMPTY file. */
777 cl_env_put(env, &refcheck);
778 cl_env_reexit(cookie);
782 /*****************************************************************************
784 * Lov object operations.
787 int lov_object_init(const struct lu_env *env, struct lu_object *obj,
788 const struct lu_object_conf *conf)
790 struct lov_device *dev = lu2lov_dev(obj->lo_dev);
791 struct lov_object *lov = lu2lov(obj);
792 const struct cl_object_conf *cconf = lu2cl_conf(conf);
793 union lov_layout_state *set = &lov->u;
794 const struct lov_layout_operations *ops;
798 init_rwsem(&lov->lo_type_guard);
799 atomic_set(&lov->lo_active_ios, 0);
800 init_waitqueue_head(&lov->lo_waitq);
802 cl_object_page_init(lu2cl(obj), sizeof(struct lov_page));
804 /* no locking is necessary, as object is being created */
805 lov->lo_type = lov_type(cconf->u.coc_md->lsm);
806 ops = &lov_dispatch[lov->lo_type];
807 result = ops->llo_init(env, dev, lov, cconf, set);
809 ops->llo_install(env, lov, set);
813 static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
814 const struct cl_object_conf *conf)
816 struct lov_stripe_md *lsm = NULL;
817 struct lov_object *lov = cl2lov(obj);
822 if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
823 lov->lo_layout_invalid = true;
824 GOTO(out, result = 0);
827 if (conf->coc_opc == OBJECT_CONF_WAIT) {
828 if (lov->lo_layout_invalid &&
829 atomic_read(&lov->lo_active_ios) > 0) {
830 lov_conf_unlock(lov);
831 result = lov_layout_wait(env, lov);
837 LASSERT(conf->coc_opc == OBJECT_CONF_SET);
839 if (conf->u.coc_md != NULL)
840 lsm = conf->u.coc_md->lsm;
841 if ((lsm == NULL && lov->lo_lsm == NULL) ||
842 ((lsm != NULL && lov->lo_lsm != NULL) &&
843 (lov->lo_lsm->lsm_layout_gen == lsm->lsm_layout_gen) &&
844 (lov->lo_lsm->lsm_pattern == lsm->lsm_pattern))) {
845 /* same version of layout */
846 lov->lo_layout_invalid = false;
847 GOTO(out, result = 0);
850 /* will change layout - check if there still exists active IO. */
851 if (atomic_read(&lov->lo_active_ios) > 0) {
852 lov->lo_layout_invalid = true;
853 GOTO(out, result = -EBUSY);
856 result = lov_layout_change(env, lov, conf);
857 lov->lo_layout_invalid = result != 0;
861 lov_conf_unlock(lov);
862 CDEBUG(D_INODE, DFID" lo_layout_invalid=%d\n",
863 PFID(lu_object_fid(lov2lu(lov))), lov->lo_layout_invalid);
867 static void lov_object_delete(const struct lu_env *env, struct lu_object *obj)
869 struct lov_object *lov = lu2lov(obj);
872 LOV_2DISPATCH_VOID(lov, llo_delete, env, lov, &lov->u);
876 static void lov_object_free(const struct lu_env *env, struct lu_object *obj)
878 struct lov_object *lov = lu2lov(obj);
881 LOV_2DISPATCH_VOID(lov, llo_fini, env, lov, &lov->u);
883 OBD_SLAB_FREE_PTR(lov, lov_object_kmem);
887 static int lov_object_print(const struct lu_env *env, void *cookie,
888 lu_printer_t p, const struct lu_object *o)
890 return LOV_2DISPATCH_NOLOCK(lu2lov(o), llo_print, env, cookie, p, o);
893 int lov_page_init(const struct lu_env *env, struct cl_object *obj,
894 struct cl_page *page, pgoff_t index)
896 return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_page_init, env, obj, page,
901 * Implements cl_object_operations::clo_io_init() method for lov
902 * layer. Dispatches to the appropriate layout io initialization method.
904 int lov_io_init(const struct lu_env *env, struct cl_object *obj,
907 CL_IO_SLICE_CLEAN(lov_env_io(env), lis_cl);
908 return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_io_init,
909 !io->ci_ignore_layout, env, obj, io);
913 * An implementation of cl_object_operations::clo_attr_get() method for lov
914 * layer. For raid0 layout this collects and merges attributes of all
917 static int lov_attr_get(const struct lu_env *env, struct cl_object *obj,
918 struct cl_attr *attr)
920 /* do not take lock, as this function is called under a
921 * spin-lock. Layout is protected from changing by ongoing IO. */
922 return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_getattr, env, obj, attr);
925 static int lov_attr_set(const struct lu_env *env, struct cl_object *obj,
926 const struct cl_attr *attr, unsigned valid)
929 * No dispatch is required here, as no layout implements this.
934 int lov_lock_init(const struct lu_env *env, struct cl_object *obj,
935 struct cl_lock *lock, const struct cl_io *io)
937 /* No need to lock because we've taken one refcount of layout. */
938 return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_lock_init, env, obj, lock,
942 static int lov_object_getstripe(const struct lu_env *env, struct cl_object *obj,
943 struct lov_user_md __user *lum)
945 struct lov_object *lov = cl2lov(obj);
946 struct lov_stripe_md *lsm;
950 lsm = lov_lsm_addref(lov);
954 rc = lov_getstripe(cl2lov(obj), lsm, lum);
955 lov_lsm_put(obj, lsm);
959 static const struct cl_object_operations lov_ops = {
960 .coo_page_init = lov_page_init,
961 .coo_lock_init = lov_lock_init,
962 .coo_io_init = lov_io_init,
963 .coo_attr_get = lov_attr_get,
964 .coo_attr_set = lov_attr_set,
965 .coo_conf_set = lov_conf_set,
966 .coo_getstripe = lov_object_getstripe
969 static const struct lu_object_operations lov_lu_obj_ops = {
970 .loo_object_init = lov_object_init,
971 .loo_object_delete = lov_object_delete,
972 .loo_object_release = NULL,
973 .loo_object_free = lov_object_free,
974 .loo_object_print = lov_object_print,
975 .loo_object_invariant = NULL
978 struct lu_object *lov_object_alloc(const struct lu_env *env,
979 const struct lu_object_header *unused,
980 struct lu_device *dev)
982 struct lov_object *lov;
983 struct lu_object *obj;
986 OBD_SLAB_ALLOC_PTR_GFP(lov, lov_object_kmem, GFP_NOFS);
989 lu_object_init(obj, NULL, dev);
990 lov->lo_cl.co_ops = &lov_ops;
991 lov->lo_type = -1; /* invalid, to catch uninitialized type */
993 * object io operation vector (cl_object::co_iop) is installed
994 * later in lov_object_init(), as different vectors are used
995 * for object with different layouts.
997 obj->lo_ops = &lov_lu_obj_ops;
1003 struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov)
1005 struct lov_stripe_md *lsm = NULL;
1007 lov_conf_freeze(lov);
1008 if (lov->lo_lsm != NULL) {
1009 lsm = lsm_addref(lov->lo_lsm);
1010 CDEBUG(D_INODE, "lsm %p addref %d/%d by %p.\n",
1011 lsm, atomic_read(&lsm->lsm_refc),
1012 lov->lo_layout_invalid, current);
1018 int lov_read_and_clear_async_rc(struct cl_object *clob)
1020 struct lu_object *luobj;
1024 luobj = lu_object_locate(&cl_object_header(clob)->coh_lu,
1026 if (luobj != NULL) {
1027 struct lov_object *lov = lu2lov(luobj);
1029 lov_conf_freeze(lov);
1030 switch (lov->lo_type) {
1032 struct lov_stripe_md *lsm;
1036 LASSERT(lsm != NULL);
1037 for (i = 0; i < lsm->lsm_stripe_count; i++) {
1038 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1040 if (lov_oinfo_is_dummy(loi))
1043 if (loi->loi_ar.ar_rc && !rc)
1044 rc = loi->loi_ar.ar_rc;
1045 loi->loi_ar.ar_rc = 0;
1058 EXPORT_SYMBOL(lov_read_and_clear_async_rc);