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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"
51 /*****************************************************************************
57 struct lov_layout_operations {
58 int (*llo_init)(const struct lu_env *env, struct lov_device *dev,
59 struct lov_object *lov,
60 const struct cl_object_conf *conf,
61 union lov_layout_state *state);
62 int (*llo_delete)(const struct lu_env *env, struct lov_object *lov,
63 union lov_layout_state *state);
64 void (*llo_fini)(const struct lu_env *env, struct lov_object *lov,
65 union lov_layout_state *state);
66 void (*llo_install)(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);
81 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov);
83 struct lov_stripe_md *lov_lsm_get(struct cl_object *clobj)
85 struct lu_object *luobj;
86 struct lov_stripe_md *lsm = NULL;
91 luobj = lu_object_locate(&cl_object_header(clobj)->coh_lu,
94 lsm = lov_lsm_addref(lu2lov(luobj));
97 EXPORT_SYMBOL(lov_lsm_get);
99 void lov_lsm_put(struct cl_object *unused, struct lov_stripe_md *lsm)
102 lov_free_memmd(&lsm);
104 EXPORT_SYMBOL(lov_lsm_put);
106 /*****************************************************************************
108 * Lov object layout operations.
112 static void lov_install_empty(const struct lu_env *env,
113 struct lov_object *lov,
114 union lov_layout_state *state)
117 * File without objects.
121 static int lov_init_empty(const struct lu_env *env,
122 struct lov_device *dev, struct lov_object *lov,
123 const struct cl_object_conf *conf,
124 union lov_layout_state *state)
129 static void lov_install_raid0(const struct lu_env *env,
130 struct lov_object *lov,
131 union lov_layout_state *state)
135 static struct cl_object *lov_sub_find(const struct lu_env *env,
136 struct cl_device *dev,
137 const struct lu_fid *fid,
138 const struct cl_object_conf *conf)
143 o = lu_object_find_at(env, cl2lu_dev(dev), fid, &conf->coc_lu);
144 LASSERT(ergo(!IS_ERR(o), o->lo_dev->ld_type == &lovsub_device_type));
148 static int lov_init_sub(const struct lu_env *env, struct lov_object *lov,
149 struct cl_object *stripe, struct lov_layout_raid0 *r0,
152 struct cl_object_header *hdr;
153 struct cl_object_header *subhdr;
154 struct cl_object_header *parent;
155 struct lov_oinfo *oinfo;
158 if (OBD_FAIL_CHECK(OBD_FAIL_LOV_INIT)) {
159 /* For sanity:test_206.
160 * Do not leave the object in cache to avoid accessing
161 * freed memory. This is because osc_object is referring to
162 * lov_oinfo of lsm_stripe_data which will be freed due to
164 cl_object_kill(env, stripe);
165 cl_object_put(env, stripe);
169 hdr = cl_object_header(lov2cl(lov));
170 subhdr = cl_object_header(stripe);
172 oinfo = lov->lo_lsm->lsm_oinfo[idx];
173 CDEBUG(D_INODE, DFID"@%p[%d] -> "DFID"@%p: ostid: "DOSTID
174 " idx: %d gen: %d\n",
175 PFID(&subhdr->coh_lu.loh_fid), subhdr, idx,
176 PFID(&hdr->coh_lu.loh_fid), hdr, POSTID(&oinfo->loi_oi),
177 oinfo->loi_ost_idx, oinfo->loi_ost_gen);
179 /* reuse ->coh_attr_guard to protect coh_parent change */
180 spin_lock(&subhdr->coh_attr_guard);
181 parent = subhdr->coh_parent;
182 if (parent == NULL) {
183 subhdr->coh_parent = hdr;
184 spin_unlock(&subhdr->coh_attr_guard);
185 subhdr->coh_nesting = hdr->coh_nesting + 1;
186 lu_object_ref_add(&stripe->co_lu, "lov-parent", lov);
187 r0->lo_sub[idx] = cl2lovsub(stripe);
188 r0->lo_sub[idx]->lso_super = lov;
189 r0->lo_sub[idx]->lso_index = idx;
192 struct lu_object *old_obj;
193 struct lov_object *old_lov;
194 unsigned int mask = D_INODE;
196 spin_unlock(&subhdr->coh_attr_guard);
197 old_obj = lu_object_locate(&parent->coh_lu, &lov_device_type);
198 LASSERT(old_obj != NULL);
199 old_lov = cl2lov(lu2cl(old_obj));
200 if (old_lov->lo_layout_invalid) {
201 /* the object's layout has already changed but isn't
203 lu_object_unhash(env, &stripe->co_lu);
210 LU_OBJECT_DEBUG(mask, env, &stripe->co_lu,
211 "stripe %d is already owned.\n", idx);
212 LU_OBJECT_DEBUG(mask, env, old_obj, "owned.\n");
213 LU_OBJECT_HEADER(mask, env, lov2lu(lov), "try to own.\n");
214 cl_object_put(env, stripe);
219 static int lov_page_slice_fixup(struct lov_object *lov,
220 struct cl_object *stripe)
222 struct cl_object_header *hdr = cl_object_header(&lov->lo_cl);
226 return hdr->coh_page_bufsize - lov->lo_cl.co_slice_off -
227 cfs_size_round(sizeof(struct lov_page));
229 cl_object_for_each(o, stripe)
230 o->co_slice_off += hdr->coh_page_bufsize;
232 return cl_object_header(stripe)->coh_page_bufsize;
235 static int lov_init_raid0(const struct lu_env *env,
236 struct lov_device *dev, struct lov_object *lov,
237 const struct cl_object_conf *conf,
238 union lov_layout_state *state)
243 struct cl_object *stripe;
244 struct lov_thread_info *lti = lov_env_info(env);
245 struct cl_object_conf *subconf = <i->lti_stripe_conf;
246 struct lov_stripe_md *lsm = conf->u.coc_md->lsm;
247 struct lu_fid *ofid = <i->lti_fid;
248 struct lov_layout_raid0 *r0 = &state->raid0;
252 if (lsm->lsm_magic != LOV_MAGIC_V1 && lsm->lsm_magic != LOV_MAGIC_V3) {
253 dump_lsm(D_ERROR, lsm);
254 LASSERTF(0, "magic mismatch, expected %d/%d, actual %d.\n",
255 LOV_MAGIC_V1, LOV_MAGIC_V3, lsm->lsm_magic);
258 LASSERT(lov->lo_lsm == NULL);
259 lov->lo_lsm = lsm_addref(lsm);
260 r0->lo_nr = lsm->lsm_stripe_count;
261 LASSERT(r0->lo_nr <= lov_targets_nr(dev));
263 lov->lo_layout_invalid = true;
265 OBD_ALLOC_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
266 if (r0->lo_sub != NULL) {
270 subconf->coc_inode = conf->coc_inode;
271 spin_lock_init(&r0->lo_sub_lock);
273 * Create stripe cl_objects.
275 for (i = 0; i < r0->lo_nr && result == 0; ++i) {
276 struct cl_device *subdev;
277 struct lov_oinfo *oinfo = lsm->lsm_oinfo[i];
278 int ost_idx = oinfo->loi_ost_idx;
280 if (lov_oinfo_is_dummy(oinfo))
283 result = ostid_to_fid(ofid, &oinfo->loi_oi,
288 subdev = lovsub2cl_dev(dev->ld_target[ost_idx]);
289 subconf->u.coc_oinfo = oinfo;
290 LASSERTF(subdev != NULL, "not init ost %d\n", ost_idx);
291 /* In the function below, .hs_keycmp resolves to
292 * lu_obj_hop_keycmp() */
293 /* coverity[overrun-buffer-val] */
294 stripe = lov_sub_find(env, subdev, ofid, subconf);
295 if (!IS_ERR(stripe)) {
296 result = lov_init_sub(env, lov, stripe, r0, i);
297 if (result == -EAGAIN) { /* try again */
303 result = PTR_ERR(stripe);
307 int sz = lov_page_slice_fixup(lov, stripe);
308 LASSERT(ergo(psz > 0, psz == sz));
313 cl_object_header(&lov->lo_cl)->coh_page_bufsize += psz;
320 static int lov_init_released(const struct lu_env *env,
321 struct lov_device *dev, struct lov_object *lov,
322 const struct cl_object_conf *conf,
323 union lov_layout_state *state)
325 struct lov_stripe_md *lsm = conf->u.coc_md->lsm;
327 LASSERT(lsm != NULL);
328 LASSERT(lsm_is_released(lsm));
329 LASSERT(lov->lo_lsm == NULL);
331 lov->lo_lsm = lsm_addref(lsm);
335 static int lov_delete_empty(const struct lu_env *env, struct lov_object *lov,
336 union lov_layout_state *state)
338 LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
340 lov_layout_wait(env, lov);
344 static void lov_subobject_kill(const struct lu_env *env, struct lov_object *lov,
345 struct lovsub_object *los, int idx)
347 struct cl_object *sub;
348 struct lov_layout_raid0 *r0;
349 struct lu_site *site;
350 struct lu_site_bkt_data *bkt;
351 wait_queue_t *waiter;
354 LASSERT(r0->lo_sub[idx] == los);
356 sub = lovsub2cl(los);
357 site = sub->co_lu.lo_dev->ld_site;
358 bkt = lu_site_bkt_from_fid(site, &sub->co_lu.lo_header->loh_fid);
360 cl_object_kill(env, sub);
361 /* release a reference to the sub-object and ... */
362 lu_object_ref_del(&sub->co_lu, "lov-parent", lov);
363 cl_object_put(env, sub);
365 /* ... wait until it is actually destroyed---sub-object clears its
366 * ->lo_sub[] slot in lovsub_object_fini() */
367 if (r0->lo_sub[idx] == los) {
368 waiter = &lov_env_info(env)->lti_waiter;
369 init_waitqueue_entry_current(waiter);
370 add_wait_queue(&bkt->lsb_marche_funebre, waiter);
371 set_current_state(TASK_UNINTERRUPTIBLE);
373 /* this wait-queue is signaled at the end of
374 * lu_object_free(). */
375 set_current_state(TASK_UNINTERRUPTIBLE);
376 spin_lock(&r0->lo_sub_lock);
377 if (r0->lo_sub[idx] == los) {
378 spin_unlock(&r0->lo_sub_lock);
379 waitq_wait(waiter, TASK_UNINTERRUPTIBLE);
381 spin_unlock(&r0->lo_sub_lock);
382 set_current_state(TASK_RUNNING);
386 remove_wait_queue(&bkt->lsb_marche_funebre, waiter);
388 LASSERT(r0->lo_sub[idx] == NULL);
391 static int lov_delete_raid0(const struct lu_env *env, struct lov_object *lov,
392 union lov_layout_state *state)
394 struct lov_layout_raid0 *r0 = &state->raid0;
395 struct lov_stripe_md *lsm = lov->lo_lsm;
400 dump_lsm(D_INODE, lsm);
402 lov_layout_wait(env, lov);
403 if (r0->lo_sub != NULL) {
404 for (i = 0; i < r0->lo_nr; ++i) {
405 struct lovsub_object *los = r0->lo_sub[i];
408 cl_object_prune(env, &los->lso_cl);
410 * If top-level object is to be evicted from
411 * the cache, so are its sub-objects.
413 lov_subobject_kill(env, lov, los, i);
420 static void lov_fini_empty(const struct lu_env *env, struct lov_object *lov,
421 union lov_layout_state *state)
423 LASSERT(lov->lo_type == LLT_EMPTY || lov->lo_type == LLT_RELEASED);
426 static void lov_fini_raid0(const struct lu_env *env, struct lov_object *lov,
427 union lov_layout_state *state)
429 struct lov_layout_raid0 *r0 = &state->raid0;
432 if (r0->lo_sub != NULL) {
433 OBD_FREE_LARGE(r0->lo_sub, r0->lo_nr * sizeof r0->lo_sub[0]);
437 dump_lsm(D_INODE, lov->lo_lsm);
438 lov_free_memmd(&lov->lo_lsm);
443 static void lov_fini_released(const struct lu_env *env, struct lov_object *lov,
444 union lov_layout_state *state)
447 dump_lsm(D_INODE, lov->lo_lsm);
448 lov_free_memmd(&lov->lo_lsm);
452 static int lov_print_empty(const struct lu_env *env, void *cookie,
453 lu_printer_t p, const struct lu_object *o)
455 (*p)(env, cookie, "empty %d\n", lu2lov(o)->lo_layout_invalid);
459 static int lov_print_raid0(const struct lu_env *env, void *cookie,
460 lu_printer_t p, const struct lu_object *o)
462 struct lov_object *lov = lu2lov(o);
463 struct lov_layout_raid0 *r0 = lov_r0(lov);
464 struct lov_stripe_md *lsm = lov->lo_lsm;
467 (*p)(env, cookie, "stripes: %d, %s, lsm{%p 0x%08X %d %u %u}:\n",
468 r0->lo_nr, lov->lo_layout_invalid ? "invalid" : "valid", lsm,
469 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
470 lsm->lsm_stripe_count, lsm->lsm_layout_gen);
471 for (i = 0; i < r0->lo_nr; ++i) {
472 struct lu_object *sub;
474 if (r0->lo_sub[i] != NULL) {
475 sub = lovsub2lu(r0->lo_sub[i]);
476 lu_object_print(env, cookie, p, sub);
478 (*p)(env, cookie, "sub %d absent\n", i);
484 static int lov_print_released(const struct lu_env *env, void *cookie,
485 lu_printer_t p, const struct lu_object *o)
487 struct lov_object *lov = lu2lov(o);
488 struct lov_stripe_md *lsm = lov->lo_lsm;
491 "released: %s, lsm{%p 0x%08X %d %u %u}:\n",
492 lov->lo_layout_invalid ? "invalid" : "valid", lsm,
493 lsm->lsm_magic, atomic_read(&lsm->lsm_refc),
494 lsm->lsm_stripe_count, lsm->lsm_layout_gen);
499 * Implements cl_object_operations::coo_attr_get() method for an object
500 * without stripes (LLT_EMPTY layout type).
502 * The only attributes this layer is authoritative in this case is
503 * cl_attr::cat_blocks---it's 0.
505 static int lov_attr_get_empty(const struct lu_env *env, struct cl_object *obj,
506 struct cl_attr *attr)
508 attr->cat_blocks = 0;
512 static int lov_attr_get_raid0(const struct lu_env *env, struct cl_object *obj,
513 struct cl_attr *attr)
515 struct lov_object *lov = cl2lov(obj);
516 struct lov_layout_raid0 *r0 = lov_r0(lov);
517 struct cl_attr *lov_attr = &r0->lo_attr;
522 /* this is called w/o holding type guard mutex, so it must be inside
523 * an on going IO otherwise lsm may be replaced.
524 * LU-2117: it turns out there exists one exception. For mmaped files,
525 * the lock of those files may be requested in the other file's IO
526 * context, and this function is called in ccc_lock_state(), it will
527 * hit this assertion.
528 * Anyway, it's still okay to call attr_get w/o type guard as layout
529 * can't go if locks exist. */
530 /* LASSERT(atomic_read(&lsm->lsm_refc) > 1); */
532 if (!r0->lo_attr_valid) {
533 struct lov_stripe_md *lsm = lov->lo_lsm;
534 struct ost_lvb *lvb = &lov_env_info(env)->lti_lvb;
537 memset(lvb, 0, sizeof(*lvb));
538 /* XXX: timestamps can be negative by sanity:test_39m,
540 lvb->lvb_atime = LLONG_MIN;
541 lvb->lvb_ctime = LLONG_MIN;
542 lvb->lvb_mtime = LLONG_MIN;
545 * XXX that should be replaced with a loop over sub-objects,
546 * doing cl_object_attr_get() on them. But for now, let's
547 * reuse old lov code.
551 * XXX take lsm spin-lock to keep lov_merge_lvb_kms()
552 * happy. It's not needed, because new code uses
553 * ->coh_attr_guard spin-lock to protect consistency of
554 * sub-object attributes.
556 lov_stripe_lock(lsm);
557 result = lov_merge_lvb_kms(lsm, lvb, &kms);
558 lov_stripe_unlock(lsm);
560 cl_lvb2attr(lov_attr, lvb);
561 lov_attr->cat_kms = kms;
562 r0->lo_attr_valid = 1;
565 if (result == 0) { /* merge results */
566 attr->cat_blocks = lov_attr->cat_blocks;
567 attr->cat_size = lov_attr->cat_size;
568 attr->cat_kms = lov_attr->cat_kms;
569 if (attr->cat_atime < lov_attr->cat_atime)
570 attr->cat_atime = lov_attr->cat_atime;
571 if (attr->cat_ctime < lov_attr->cat_ctime)
572 attr->cat_ctime = lov_attr->cat_ctime;
573 if (attr->cat_mtime < lov_attr->cat_mtime)
574 attr->cat_mtime = lov_attr->cat_mtime;
579 const static struct lov_layout_operations lov_dispatch[] = {
581 .llo_init = lov_init_empty,
582 .llo_delete = lov_delete_empty,
583 .llo_fini = lov_fini_empty,
584 .llo_install = lov_install_empty,
585 .llo_print = lov_print_empty,
586 .llo_page_init = lov_page_init_empty,
587 .llo_lock_init = lov_lock_init_empty,
588 .llo_io_init = lov_io_init_empty,
589 .llo_getattr = lov_attr_get_empty
592 .llo_init = lov_init_raid0,
593 .llo_delete = lov_delete_raid0,
594 .llo_fini = lov_fini_raid0,
595 .llo_install = lov_install_raid0,
596 .llo_print = lov_print_raid0,
597 .llo_page_init = lov_page_init_raid0,
598 .llo_lock_init = lov_lock_init_raid0,
599 .llo_io_init = lov_io_init_raid0,
600 .llo_getattr = lov_attr_get_raid0
603 .llo_init = lov_init_released,
604 .llo_delete = lov_delete_empty,
605 .llo_fini = lov_fini_released,
606 .llo_install = lov_install_empty,
607 .llo_print = lov_print_released,
608 .llo_page_init = lov_page_init_empty,
609 .llo_lock_init = lov_lock_init_empty,
610 .llo_io_init = lov_io_init_released,
611 .llo_getattr = lov_attr_get_empty
616 * Performs a double-dispatch based on the layout type of an object.
618 #define LOV_2DISPATCH_NOLOCK(obj, op, ...) \
620 struct lov_object *__obj = (obj); \
621 enum lov_layout_type __llt; \
623 __llt = __obj->lo_type; \
624 LASSERT(0 <= __llt && __llt < ARRAY_SIZE(lov_dispatch)); \
625 lov_dispatch[__llt].op(__VA_ARGS__); \
629 * Return lov_layout_type associated with a given lsm
631 static enum lov_layout_type lov_type(struct lov_stripe_md *lsm)
635 if (lsm_is_released(lsm))
640 static inline void lov_conf_freeze(struct lov_object *lov)
642 if (lov->lo_owner != current)
643 down_read(&lov->lo_type_guard);
646 static inline void lov_conf_thaw(struct lov_object *lov)
648 if (lov->lo_owner != current)
649 up_read(&lov->lo_type_guard);
652 #define LOV_2DISPATCH_MAYLOCK(obj, op, lock, ...) \
654 struct lov_object *__obj = (obj); \
655 int __lock = !!(lock); \
656 typeof(lov_dispatch[0].op(__VA_ARGS__)) __result; \
659 lov_conf_freeze(__obj); \
660 __result = LOV_2DISPATCH_NOLOCK(obj, op, __VA_ARGS__); \
662 lov_conf_thaw(__obj); \
667 * Performs a locked double-dispatch based on the layout type of an object.
669 #define LOV_2DISPATCH(obj, op, ...) \
670 LOV_2DISPATCH_MAYLOCK(obj, op, 1, __VA_ARGS__)
672 #define LOV_2DISPATCH_VOID(obj, op, ...) \
674 struct lov_object *__obj = (obj); \
675 enum lov_layout_type __llt; \
677 lov_conf_freeze(__obj); \
678 __llt = __obj->lo_type; \
679 LASSERT(0 <= __llt && __llt < ARRAY_SIZE(lov_dispatch)); \
680 lov_dispatch[__llt].op(__VA_ARGS__); \
681 lov_conf_thaw(__obj); \
684 static void lov_conf_lock(struct lov_object *lov)
686 LASSERT(lov->lo_owner != current);
687 down_write(&lov->lo_type_guard);
688 LASSERT(lov->lo_owner == NULL);
689 lov->lo_owner = current;
692 static void lov_conf_unlock(struct lov_object *lov)
694 lov->lo_owner = NULL;
695 up_write(&lov->lo_type_guard);
698 static int lov_layout_wait(const struct lu_env *env, struct lov_object *lov)
700 struct l_wait_info lwi = { 0 };
703 while (atomic_read(&lov->lo_active_ios) > 0) {
704 CDEBUG(D_INODE, "file:"DFID" wait for active IO, now: %d.\n",
705 PFID(lu_object_fid(lov2lu(lov))),
706 atomic_read(&lov->lo_active_ios));
708 l_wait_event(lov->lo_waitq,
709 atomic_read(&lov->lo_active_ios) == 0, &lwi);
714 static int lov_layout_change(const struct lu_env *unused,
715 struct lov_object *lov,
716 const struct cl_object_conf *conf)
719 enum lov_layout_type llt = LLT_EMPTY;
720 union lov_layout_state *state = &lov->u;
721 const struct lov_layout_operations *old_ops;
722 const struct lov_layout_operations *new_ops;
729 LASSERT(0 <= lov->lo_type && lov->lo_type < ARRAY_SIZE(lov_dispatch));
731 if (conf->u.coc_md != NULL)
732 llt = lov_type(conf->u.coc_md->lsm);
733 LASSERT(0 <= llt && llt < ARRAY_SIZE(lov_dispatch));
735 cookie = cl_env_reenter();
736 env = cl_env_get(&refcheck);
738 cl_env_reexit(cookie);
739 RETURN(PTR_ERR(env));
742 CDEBUG(D_INODE, DFID" from %s to %s\n",
743 PFID(lu_object_fid(lov2lu(lov))),
744 llt2str(lov->lo_type), llt2str(llt));
746 old_ops = &lov_dispatch[lov->lo_type];
747 new_ops = &lov_dispatch[llt];
749 result = cl_object_prune(env, &lov->lo_cl);
753 result = old_ops->llo_delete(env, lov, &lov->u);
755 old_ops->llo_fini(env, lov, &lov->u);
757 LASSERT(atomic_read(&lov->lo_active_ios) == 0);
759 lov->lo_type = LLT_EMPTY;
760 /* page bufsize fixup */
761 cl_object_header(&lov->lo_cl)->coh_page_bufsize -=
762 lov_page_slice_fixup(lov, NULL);
764 result = new_ops->llo_init(env,
765 lu2lov_dev(lov->lo_cl.co_lu.lo_dev),
768 new_ops->llo_install(env, lov, state);
771 new_ops->llo_delete(env, lov, state);
772 new_ops->llo_fini(env, lov, state);
773 /* this file becomes an EMPTY file. */
778 cl_env_put(env, &refcheck);
779 cl_env_reexit(cookie);
783 /*****************************************************************************
785 * Lov object operations.
788 int lov_object_init(const struct lu_env *env, struct lu_object *obj,
789 const struct lu_object_conf *conf)
791 struct lov_device *dev = lu2lov_dev(obj->lo_dev);
792 struct lov_object *lov = lu2lov(obj);
793 const struct cl_object_conf *cconf = lu2cl_conf(conf);
794 union lov_layout_state *set = &lov->u;
795 const struct lov_layout_operations *ops;
799 init_rwsem(&lov->lo_type_guard);
800 atomic_set(&lov->lo_active_ios, 0);
801 init_waitqueue_head(&lov->lo_waitq);
803 cl_object_page_init(lu2cl(obj), sizeof(struct lov_page));
805 /* no locking is necessary, as object is being created */
806 lov->lo_type = lov_type(cconf->u.coc_md->lsm);
807 ops = &lov_dispatch[lov->lo_type];
808 result = ops->llo_init(env, dev, lov, cconf, set);
810 ops->llo_install(env, lov, set);
814 static int lov_conf_set(const struct lu_env *env, struct cl_object *obj,
815 const struct cl_object_conf *conf)
817 struct lov_stripe_md *lsm = NULL;
818 struct lov_object *lov = cl2lov(obj);
823 if (conf->coc_opc == OBJECT_CONF_INVALIDATE) {
824 lov->lo_layout_invalid = true;
825 GOTO(out, result = 0);
828 if (conf->coc_opc == OBJECT_CONF_WAIT) {
829 if (lov->lo_layout_invalid &&
830 atomic_read(&lov->lo_active_ios) > 0) {
831 lov_conf_unlock(lov);
832 result = lov_layout_wait(env, lov);
838 LASSERT(conf->coc_opc == OBJECT_CONF_SET);
840 if (conf->u.coc_md != NULL)
841 lsm = conf->u.coc_md->lsm;
842 if ((lsm == NULL && lov->lo_lsm == NULL) ||
843 ((lsm != NULL && lov->lo_lsm != NULL) &&
844 (lov->lo_lsm->lsm_layout_gen == lsm->lsm_layout_gen) &&
845 (lov->lo_lsm->lsm_pattern == lsm->lsm_pattern))) {
846 /* same version of layout */
847 lov->lo_layout_invalid = false;
848 GOTO(out, result = 0);
851 /* will change layout - check if there still exists active IO. */
852 if (atomic_read(&lov->lo_active_ios) > 0) {
853 lov->lo_layout_invalid = true;
854 GOTO(out, result = -EBUSY);
857 result = lov_layout_change(env, lov, conf);
858 lov->lo_layout_invalid = result != 0;
862 lov_conf_unlock(lov);
863 CDEBUG(D_INODE, DFID" lo_layout_invalid=%d\n",
864 PFID(lu_object_fid(lov2lu(lov))), lov->lo_layout_invalid);
868 static void lov_object_delete(const struct lu_env *env, struct lu_object *obj)
870 struct lov_object *lov = lu2lov(obj);
873 LOV_2DISPATCH_VOID(lov, llo_delete, env, lov, &lov->u);
877 static void lov_object_free(const struct lu_env *env, struct lu_object *obj)
879 struct lov_object *lov = lu2lov(obj);
882 LOV_2DISPATCH_VOID(lov, llo_fini, env, lov, &lov->u);
884 OBD_SLAB_FREE_PTR(lov, lov_object_kmem);
888 static int lov_object_print(const struct lu_env *env, void *cookie,
889 lu_printer_t p, const struct lu_object *o)
891 return LOV_2DISPATCH_NOLOCK(lu2lov(o), llo_print, env, cookie, p, o);
894 int lov_page_init(const struct lu_env *env, struct cl_object *obj,
895 struct cl_page *page, pgoff_t index)
897 return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_page_init, env, obj, page,
902 * Implements cl_object_operations::clo_io_init() method for lov
903 * layer. Dispatches to the appropriate layout io initialization method.
905 int lov_io_init(const struct lu_env *env, struct cl_object *obj,
908 CL_IO_SLICE_CLEAN(lov_env_io(env), lis_cl);
909 return LOV_2DISPATCH_MAYLOCK(cl2lov(obj), llo_io_init,
910 !io->ci_ignore_layout, env, obj, io);
914 * An implementation of cl_object_operations::clo_attr_get() method for lov
915 * layer. For raid0 layout this collects and merges attributes of all
918 static int lov_attr_get(const struct lu_env *env, struct cl_object *obj,
919 struct cl_attr *attr)
921 /* do not take lock, as this function is called under a
922 * spin-lock. Layout is protected from changing by ongoing IO. */
923 return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_getattr, env, obj, attr);
926 static int lov_attr_set(const struct lu_env *env, struct cl_object *obj,
927 const struct cl_attr *attr, unsigned valid)
930 * No dispatch is required here, as no layout implements this.
935 int lov_lock_init(const struct lu_env *env, struct cl_object *obj,
936 struct cl_lock *lock, const struct cl_io *io)
938 /* No need to lock because we've taken one refcount of layout. */
939 return LOV_2DISPATCH_NOLOCK(cl2lov(obj), llo_lock_init, env, obj, lock,
943 static int lov_object_getstripe(const struct lu_env *env, struct cl_object *obj,
944 struct lov_user_md __user *lum)
946 struct lov_object *lov = cl2lov(obj);
947 struct lov_stripe_md *lsm;
951 lsm = lov_lsm_addref(lov);
955 rc = lov_getstripe(cl2lov(obj), lsm, lum);
956 lov_lsm_put(obj, lsm);
960 static const struct cl_object_operations lov_ops = {
961 .coo_page_init = lov_page_init,
962 .coo_lock_init = lov_lock_init,
963 .coo_io_init = lov_io_init,
964 .coo_attr_get = lov_attr_get,
965 .coo_attr_set = lov_attr_set,
966 .coo_conf_set = lov_conf_set,
967 .coo_getstripe = lov_object_getstripe
970 static const struct lu_object_operations lov_lu_obj_ops = {
971 .loo_object_init = lov_object_init,
972 .loo_object_delete = lov_object_delete,
973 .loo_object_release = NULL,
974 .loo_object_free = lov_object_free,
975 .loo_object_print = lov_object_print,
976 .loo_object_invariant = NULL
979 struct lu_object *lov_object_alloc(const struct lu_env *env,
980 const struct lu_object_header *unused,
981 struct lu_device *dev)
983 struct lov_object *lov;
984 struct lu_object *obj;
987 OBD_SLAB_ALLOC_PTR_GFP(lov, lov_object_kmem, GFP_NOFS);
990 lu_object_init(obj, NULL, dev);
991 lov->lo_cl.co_ops = &lov_ops;
992 lov->lo_type = -1; /* invalid, to catch uninitialized type */
994 * object io operation vector (cl_object::co_iop) is installed
995 * later in lov_object_init(), as different vectors are used
996 * for object with different layouts.
998 obj->lo_ops = &lov_lu_obj_ops;
1004 struct lov_stripe_md *lov_lsm_addref(struct lov_object *lov)
1006 struct lov_stripe_md *lsm = NULL;
1008 lov_conf_freeze(lov);
1009 if (lov->lo_lsm != NULL) {
1010 lsm = lsm_addref(lov->lo_lsm);
1011 CDEBUG(D_INODE, "lsm %p addref %d/%d by %p.\n",
1012 lsm, atomic_read(&lsm->lsm_refc),
1013 lov->lo_layout_invalid, current);
1019 int lov_read_and_clear_async_rc(struct cl_object *clob)
1021 struct lu_object *luobj;
1025 luobj = lu_object_locate(&cl_object_header(clob)->coh_lu,
1027 if (luobj != NULL) {
1028 struct lov_object *lov = lu2lov(luobj);
1030 lov_conf_freeze(lov);
1031 switch (lov->lo_type) {
1033 struct lov_stripe_md *lsm;
1037 LASSERT(lsm != NULL);
1038 for (i = 0; i < lsm->lsm_stripe_count; i++) {
1039 struct lov_oinfo *loi = lsm->lsm_oinfo[i];
1041 if (lov_oinfo_is_dummy(loi))
1044 if (loi->loi_ar.ar_rc && !rc)
1045 rc = loi->loi_ar.ar_rc;
1046 loi->loi_ar.ar_rc = 0;
1059 EXPORT_SYMBOL(lov_read_and_clear_async_rc);