1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (c) 2002 Cluster File Systems, Inc. <info@clusterfs.com>
6 * This file is part of Lustre, http://www.lustre.org.
8 * Lustre is free software; you can redistribute it and/or
9 * modify it under the terms of version 2 of the GNU General Public
10 * License as published by the Free Software Foundation.
12 * Lustre is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with Lustre; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #define DEBUG_SUBSYSTEM S_CMOBD
24 #include <linux/version.h>
25 #include <linux/init.h>
26 #include <linux/obd_support.h>
27 #include <linux/lustre_lib.h>
28 #include <linux/lustre_net.h>
29 #include <linux/lustre_idl.h>
30 #include <linux/obd_class.h>
31 #include <linux/lustre_mds.h>
32 #include <linux/lustre_cmobd.h>
34 #include <asm/div64.h>
35 #include <linux/pagemap.h>
37 #include "cm_internal.h"
39 extern kmem_cache_t *cmobd_extent_slab;
41 /* helper function to split an extent */
42 static obd_count split_extent(struct ldlm_extent *ext, unsigned long interval)
44 obd_count buf_count, remainder;
47 buf_count = ext->end - ext->start + 1;
48 LASSERT(buf_count > 0);
50 remainder = do_div(buf_count, interval);
57 static int cmobd_ap_make_ready(void *data, int cmd)
59 struct cmobd_async_page *cmap = (struct cmobd_async_page *)data;
60 struct page *page = cmap->cmap_page;
63 if (cmd == OBD_BRW_READ)
66 if (TryLockPage(page))
72 static int cmobd_ap_refresh_count(void *data, int cmd)
74 struct cmobd_async_page *cmap = (struct cmobd_async_page *)data;
75 struct page *page = cmap->cmap_page;
76 struct inode *inode = page->mapping->host;
79 LASSERT(cmd != OBD_BRW_READ);
81 /* catch race with truncate */
82 if (((loff_t)page->index << PAGE_SHIFT) >= inode->i_size)
85 /* catch sub-page write at end of file */
86 if (((loff_t)page->index << PAGE_SHIFT) + PAGE_SIZE > inode->i_size)
87 RETURN(inode->i_size % PAGE_SIZE);
92 static void cmobd_ap_fill_obdo(void *data, int cmd, struct obdo *oa)
94 struct cmobd_async_page *cmap = (struct cmobd_async_page *)data;
104 inode = cmap->cmap_page->mapping->host;
105 oa->o_id = cmap->cmap_es->es_oa.o_id;
106 oa->o_gr = cmap->cmap_es->es_oa.o_gr;
107 oa->o_valid = OBD_MD_FLID | OBD_MD_FLGROUP;
108 valid_flags = OBD_MD_FLTYPE | OBD_MD_FLATIME;
109 if (cmd == OBD_BRW_WRITE) {
110 oa->o_valid |= OBD_MD_FLIFID;
112 /* FIXME-UMKA: should be here some mds num and mds id? */
113 mdc_pack_id(obdo_id(oa), inode->i_ino, 0,
114 inode->i_mode, 0, 0);
115 valid_flags |= OBD_MD_FLMTIME | OBD_MD_FLCTIME;
118 obdo_from_inode(oa, inode, valid_flags);
124 static void cmobd_ap_completion(void *data, int cmd, struct obdo *oa, int rc)
126 struct cmobd_async_page *cmap = (struct cmobd_async_page *)data;
127 struct cmobd_extent_set *set = cmap->cmap_es;
133 page = cmap->cmap_page;
134 LASSERT(PageLocked(page));
140 spin_lock_irqsave(&set->es_lock, flags);
141 LASSERT(!list_empty(&set->es_pages));
142 LASSERT(!list_empty(&cmap->cmap_link));
144 list_del_init(&cmap->cmap_link);
145 if (list_empty(&set->es_pages) && !set->es_count)
147 spin_unlock_irqrestore(&set->es_lock, flags);
149 obd_teardown_async_page(set->es_exp, set->es_lsm, NULL,
151 OBD_FREE(cmap, sizeof(*cmap));
154 page_cache_release(page);
157 wake_up(&set->es_waitq);
162 static struct obd_async_page_ops cmobd_async_page_ops = {
163 .ap_make_ready = cmobd_ap_make_ready,
164 .ap_refresh_count = cmobd_ap_refresh_count,
165 .ap_fill_obdo = cmobd_ap_fill_obdo,
166 .ap_completion = cmobd_ap_completion,
169 static int cmobd_send_pages(struct obd_device *obd,
170 struct niobuf_local *lnb,
172 struct cmobd_extent_set *set)
174 struct cm_obd *cmobd = &obd->u.cm;
175 struct obd_export *exp = cmobd->master_exp;
176 struct cmobd_async_page *cmap = NULL;
182 for (i = 0; i < oa_bufs; i++, lnb++) {
184 OBD_ALLOC(cmap, sizeof(*cmap));
186 CERROR("Not enought memory\n");
190 INIT_LIST_HEAD(&cmap->cmap_link);
191 cmap->cmap_page = lnb->page;
194 rc = obd_prep_async_page(exp, set->es_lsm, NULL, lnb->page,
195 lnb->offset, &cmobd_async_page_ops,
196 cmap, &cmap->cmap_cookie);
198 CERROR("cmobd prep async page failed page(%p) rc(%d)\n",
200 OBD_FREE(cmap, sizeof(*cmap));
204 LASSERT(cmap->cmap_page);
205 LASSERT(!PageLocked(cmap->cmap_page));
206 LASSERT(Page_Uptodate(cmap->cmap_page));
207 page_cache_get(cmap->cmap_page);
209 spin_lock_irqsave(&set->es_lock, flags);
210 list_add_tail(&cmap->cmap_link, &set->es_pages);
211 spin_unlock_irqrestore(&set->es_lock, flags);
213 rc = obd_queue_async_io(exp, set->es_lsm, NULL, cmap->cmap_cookie,
214 OBD_BRW_WRITE, 0, 0, 0, 0);
215 if (rc) { /* try sync io */
216 struct obd_io_group *oig;
218 spin_lock_irqsave(&set->es_lock, flags);
219 list_del_init(&cmap->cmap_link);
220 spin_unlock_irqrestore(&set->es_lock, flags);
222 lock_page(cmap->cmap_page);
228 rc = obd_queue_group_io(exp, set->es_lsm, NULL, oig,
230 OBD_BRW_WRITE, 0, lnb->len, 0,
231 ASYNC_READY | ASYNC_URGENT |
238 rc = obd_trigger_group_io(exp, set->es_lsm, NULL, oig);
246 unlock_page(cmap->cmap_page);
247 page_cache_release(cmap->cmap_page);
248 obd_teardown_async_page(exp, set->es_lsm, NULL,
250 OBD_FREE(cmap, sizeof(*cmap));
252 CERROR("cmobd sync io failed\n");
260 static int cmobd_write_extent(struct obd_device *obd,
261 struct cmobd_extent_info *ei)
263 struct cmobd_extent_set *set = ei->ei_set;
264 struct cm_obd *cmobd = &obd->u.cm;
266 struct obd_ioobj ioo;
267 struct niobuf_local *lnb;
268 struct niobuf_remote *rnb;
269 obd_count i, oa_bufs;
272 int ret, rc = 0, wakeup = 0;
275 oa_bufs = split_extent(&ei->ei_extent, PAGE_SIZE);
276 LASSERT(oa_bufs > 0);
278 OBD_ALLOC(lnb, oa_bufs * sizeof(struct niobuf_local));
279 OBD_ALLOC(rnb, oa_bufs * sizeof(struct niobuf_remote));
282 if (lnb == NULL || rnb == NULL || oa == NULL)
283 GOTO(out, rc = -ENOMEM);
285 LASSERT(ei->ei_extent.end >= ei->ei_extent.start);
286 LASSERT((ei->ei_extent.start & (PAGE_SIZE -1)) == 0);
288 for (i = 0, offset = ei->ei_extent.start; i < oa_bufs;
289 i++, offset += PAGE_SIZE) {
290 rnb[i].offset = offset;
291 rnb[i].len = MIN(PAGE_SIZE, ei->ei_extent.end - offset + 1);
294 memcpy(oa, &set->es_oa, sizeof(*oa));
295 obdo_to_ioobj(oa, &ioo);
296 ioo.ioo_bufcnt = oa_bufs;
298 ret = obd_preprw(OBD_BRW_READ, cmobd->cache_exp, oa, 1, &ioo,
299 oa_bufs, rnb, lnb, NULL);
303 rc = cmobd_send_pages(obd, lnb, oa_bufs, set);
305 CERROR("cmobd_send_pages failed %d\n", rc);
307 rc = obd_commitrw(OBD_BRW_READ, cmobd->cache_exp, oa, 1, &ioo,
308 oa_bufs, lnb, NULL, ret);
310 /* countdown and wake up */
311 spin_lock_irqsave(&set->es_lock, flags);
312 LASSERT(set->es_count);
316 spin_unlock_irqrestore(&set->es_lock, flags);
319 wake_up(&set->es_waitq);
323 OBD_FREE(lnb, oa_bufs * sizeof(struct niobuf_local));
325 OBD_FREE(rnb, oa_bufs * sizeof(struct niobuf_remote));
332 static struct cmobd_extent_info* get_next_ei(struct cmobd_write_service *ws)
334 struct cmobd_extent_info *ei = NULL;
338 spin_lock_irqsave(&ws->ws_extent_lock, flags);
339 if (!list_empty(&ws->ws_extents)) {
340 ei = list_entry(ws->ws_extents.next,
341 struct cmobd_extent_info, ei_link);
342 list_del_init(&ei->ei_link);
344 if (ws->ws_nextents < CMOBD_MAX_EXTENTS)
347 spin_unlock_irqrestore(&ws->ws_extent_lock, flags);
350 wake_up_all(&ws->ws_waitq_provider);
355 static int cmobd_write_main(void *arg)
357 struct ptlrpc_svc_data *data = (struct ptlrpc_svc_data *)arg;
358 struct ptlrpc_thread *thread = data->thread;
359 struct obd_device *obd = data->dev;
360 struct cm_obd *cmobd = &obd->u.cm;
361 struct cmobd_write_service *ws = cmobd->write_srv;
362 struct cmobd_extent_info *extent = NULL;
368 /* vv ptlrpc_daemonize(); vv */
371 current->session = 1;
377 /* ^^ ptlrpc_daemonize(); ^^ */
379 SIGNAL_MASK_LOCK(current, flags);
380 sigfillset(¤t->blocked);
382 SIGNAL_MASK_UNLOCK(current, flags);
384 LASSERTF(strlen(data->name) < sizeof(current->comm),
385 "name %d > len %d\n",strlen(data->name),sizeof(current->comm));
386 THREAD_NAME(current->comm, sizeof(current->comm) - 1, "%s", data->name);
390 thread->t_flags = SVC_RUNNING;
391 wake_up(&thread->t_ctl_waitq);
393 /* Record that the thread is running */
394 spin_lock_irqsave(&ws->ws_thread_lock, flags);
396 spin_unlock_irqrestore(&ws->ws_thread_lock, flags);
398 while ((thread->t_flags & SVC_STOPPING) == 0) {
399 struct l_wait_info lwi = { 0 };
401 l_wait_event_exclusive(ws->ws_waitq_consumer,
402 ((thread->t_flags & SVC_STOPPING) ||
403 ((extent = get_next_ei(ws)) !=
408 rc = cmobd_write_extent(obd, extent);
410 CERROR("write extent failed rc=%d\n", rc);
411 OBD_SLAB_FREE(extent, cmobd_extent_slab, sizeof(*extent));
415 thread->t_flags = SVC_STOPPED;
416 wake_up(&thread->t_ctl_waitq);
418 spin_lock_irqsave(&ws->ws_thread_lock, flags);
419 ws->ws_nthreads--; /* must know immediately */
420 spin_unlock_irqrestore(&ws->ws_thread_lock, flags);
425 /* functions for manipulating cmobd write replay threads, similar with
426 * ptlrpc threads functions */
427 static int cmobd_start_thread(struct obd_device *obd, char *name)
429 struct cm_obd *cmobd = &obd->u.cm;
430 struct cmobd_write_service *ws = cmobd->write_srv;
431 struct l_wait_info lwi = { 0 };
432 struct ptlrpc_svc_data d;
433 struct ptlrpc_thread *thread;
438 OBD_ALLOC(thread, sizeof(*thread));
441 init_waitqueue_head(&thread->t_ctl_waitq);
448 spin_lock_irqsave(&ws->ws_thread_lock, flags);
449 list_add(&thread->t_link, &ws->ws_threads);
450 spin_unlock_irqrestore(&ws->ws_thread_lock, flags);
452 /* CLONE_VM and CLONE_FILES just avoid a needless copy, because we
453 * just drop the VM and FILES in ptlrpc_daemonize() right away.
455 rc = kernel_thread(cmobd_write_main, &d, CLONE_VM | CLONE_FILES);
457 CERROR("cannot start thread: %d\n", rc);
458 spin_lock_irqsave(&ws->ws_thread_lock, flags);
459 list_del_init(&thread->t_link);
460 spin_unlock_irqrestore(&ws->ws_thread_lock, flags);
461 OBD_FREE(thread, sizeof(*thread));
464 l_wait_event(thread->t_ctl_waitq, thread->t_flags & SVC_RUNNING, &lwi);
470 static void cmobd_stop_thread(struct obd_device *obd,
471 struct ptlrpc_thread *thread)
473 struct cm_obd *cmobd = &obd->u.cm;
474 struct cmobd_write_service *ws = cmobd->write_srv;
475 struct l_wait_info lwi = { 0 };
479 thread->t_flags = SVC_STOPPING;
480 wake_up_all(&ws->ws_waitq_consumer);
482 l_wait_event(thread->t_ctl_waitq, (thread->t_flags & SVC_STOPPED),
485 spin_lock_irqsave(&ws->ws_thread_lock, flags);
486 list_del(&thread->t_link);
487 spin_unlock_irqrestore(&ws->ws_thread_lock, flags);
489 OBD_FREE(thread, sizeof(*thread));
493 static void cmobd_stop_all_threads(struct obd_device *obd)
495 struct cm_obd *cmobd = &obd->u.cm;
496 struct cmobd_write_service *ws = cmobd->write_srv;
498 struct ptlrpc_thread *thread;
501 spin_lock_irqsave(&ws->ws_thread_lock, flags);
502 while (!list_empty(&ws->ws_threads)) {
503 thread = list_entry(ws->ws_threads.next,
504 struct ptlrpc_thread, t_link);
506 spin_unlock_irqrestore(&ws->ws_thread_lock, flags);
507 cmobd_stop_thread(obd, thread);
508 spin_lock_irqsave(&ws->ws_thread_lock, flags);
511 spin_unlock_irqrestore(&ws->ws_thread_lock, flags);
515 static int cmobd_start_n_threads(struct obd_device *obd, int num_threads,
521 for (i = 0; i < num_threads; i++) {
523 snprintf(name, sizeof(name) - 1, "%s_%02d", base_name, i);
524 rc = cmobd_start_thread(obd, name);
526 CERROR("cannot start %s thread #%d: rc %d\n", base_name,
528 cmobd_stop_all_threads(obd);
534 void cmobd_cleanup_write_srv(struct obd_device *obd)
536 struct cm_obd *cmobd = &obd->u.cm;
537 struct list_head *pos, *n;
538 struct cmobd_extent_info *ei;
541 cmobd_stop_all_threads(obd);
543 list_for_each_safe(pos, n, &cmobd->write_srv->ws_extents) {
544 ei = list_entry(pos, struct cmobd_extent_info, ei_link);
545 list_del_init(&ei->ei_link);
546 OBD_FREE(ei, sizeof(*ei));
548 OBD_FREE(cmobd->write_srv, sizeof(*cmobd->write_srv));
552 int cmobd_init_write_srv(struct obd_device *obd)
554 struct cm_obd *cmobd = &obd->u.cm;
555 struct cmobd_write_service *ws;
559 OBD_ALLOC(cmobd->write_srv, sizeof(*cmobd->write_srv));
560 if (cmobd->write_srv == NULL)
562 ws = cmobd->write_srv;
564 INIT_LIST_HEAD(&ws->ws_threads);
565 spin_lock_init(&ws->ws_thread_lock);
568 INIT_LIST_HEAD(&ws->ws_extents);
569 spin_lock_init(&ws->ws_extent_lock);
571 init_waitqueue_head(&ws->ws_waitq_provider);
572 init_waitqueue_head(&ws->ws_waitq_consumer);
574 rc = cmobd_start_n_threads(obd, CMOBD_NUM_THREADS, "cm_write");
576 cmobd_cleanup_write_srv(obd);
581 static int extent_queue_full(struct cmobd_write_service *ws)
586 spin_lock_irqsave(&ws->ws_extent_lock, flags);
587 full = (ws->ws_nextents >= CMOBD_MAX_EXTENTS) ? 1 : 0;
588 spin_unlock_irqrestore(&ws->ws_extent_lock, flags);
593 static void cmobd_queue_extent(struct obd_device *obd,
594 struct cmobd_extent_info *ex)
596 struct cm_obd *cmobd = &obd->u.cm;
597 struct cmobd_write_service *ws = cmobd->write_srv;
598 struct cmobd_extent_set *set = ex->ei_set;
600 struct l_wait_info lwi = { 0 };
604 l_wait_event(ws->ws_waitq_provider, !extent_queue_full(ws), &lwi);
606 spin_lock_irqsave(&ws->ws_extent_lock, flags);
607 if (ws->ws_nextents >= CMOBD_MAX_EXTENTS) {
608 spin_unlock_irqrestore(&ws->ws_extent_lock, flags);
611 list_add_tail(&ex->ei_link, &ws->ws_extents);
613 spin_unlock_irqrestore(&ws->ws_extent_lock, flags);
615 spin_lock_irqsave(&set->es_lock, flags);
617 spin_unlock_irqrestore(&set->es_lock, flags);
619 wake_up_all(&ws->ws_waitq_consumer);
624 static obd_size cmobd_id2size(struct obd_export *exp, obd_id id, obd_gr grp)
626 struct lvfs_run_ctxt saved;
627 struct dentry *de = NULL;
631 push_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
633 de = obd_lvfs_id2dentry(exp, id, 0, grp);
636 size = de->d_inode->i_size;
639 pop_ctxt(&saved, &exp->exp_obd->obd_lvfs_ctxt, NULL);
644 static int extent_set_done(struct cmobd_extent_set *set, int phase)
649 spin_lock_irqsave(&set->es_lock, flags);
651 done = set->es_count ? 0 : 1;
653 done = (!set->es_count && list_empty(&set->es_pages)) ? 1 : 0;
654 spin_unlock_irqrestore(&set->es_lock, flags);
659 int cmobd_replay_write(struct obd_device *obd, struct obdo *oa,
660 struct ldlm_extent *ext)
662 struct cm_obd *cmobd = &obd->u.cm;
663 struct lov_obd *lov = &cmobd->master_obd->u.lov;
664 struct lov_stripe_md *lsm = NULL;
665 struct cmobd_extent_set set;
666 struct cmobd_extent_info *ex;
667 struct l_wait_info lwi = { 0 };
668 struct list_head *pos, *n;
669 struct cmobd_async_page *cmap;
671 obd_count i, buf_count;
676 rc = cmobd_dummy_lsm(&lsm, lov->desc.ld_tgt_count, oa,
677 (__u32)lov->desc.ld_default_stripe_size);
681 set.es_extent.start = ext->start;
682 set.es_extent.end = ext->end;
684 set.es_exp = cmobd->master_exp;
685 set.es_ext_sz = CMOBD_MAX_EXTENT_SZ;
687 memcpy(&set.es_oa, oa, sizeof(*oa));
689 INIT_LIST_HEAD(&set.es_pages);
690 spin_lock_init(&set.es_lock);
691 init_waitqueue_head(&set.es_waitq);
693 if (set.es_extent.end < set.es_extent.start) {
694 CDEBUG(D_HA, "illegal extent in write replay\n");
695 GOTO(out, rc = -EINVAL);
697 /* start of extent is extended to page boundaries */
698 set.es_extent.start -= set.es_extent.start & ~PAGE_MASK;
699 /* if the end of extent is EOF, set it as file size */
700 if (set.es_extent.end == OBD_OBJECT_EOF) {
701 set.es_extent.end = cmobd_id2size(cmobd->cache_exp,
702 oa->o_id, oa->o_gr) - 1;
703 if (set.es_extent.end <= 0)
707 buf_count = split_extent(&set.es_extent, set.es_ext_sz);
708 for (i = 0, start = set.es_extent.start; i < buf_count;
709 i++, start += set.es_ext_sz) {
710 OBD_SLAB_ALLOC(ex, cmobd_extent_slab, SLAB_NOFS, sizeof(*ex));
712 CERROR("not enough memory\n");
716 INIT_LIST_HEAD(&ex->ei_link);
718 ex->ei_extent.start = start;
719 ex->ei_extent.end = start + set.es_ext_sz - 1;
720 if (ex->ei_extent.end > set.es_extent.end)
721 ex->ei_extent.end = set.es_extent.end;
723 cmobd_queue_extent(obd, ex);
726 l_wait_event(set.es_waitq, extent_set_done(&set, 1), &lwi);
728 /* fire remaining ios */
729 spin_lock_irqsave(&set.es_lock, flags);
730 list_for_each_safe (pos, n, &set.es_pages) {
731 cmap = list_entry(pos, struct cmobd_async_page, cmap_link);
733 /* locked pages are in flight */
734 if (PageLocked(cmap->cmap_page))
737 spin_unlock_irqrestore(&set.es_lock, flags);
738 rc = obd_set_async_flags(set.es_exp, set.es_lsm, NULL,
742 CERROR("cmobd set async flags failed\n");
743 spin_lock_irqsave(&set.es_lock, flags);
746 spin_unlock_irqrestore(&set.es_lock, flags);
748 l_wait_event(set.es_waitq, extent_set_done(&set, 2), &lwi);
750 cmobd_free_lsm(&lsm);