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).
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17 * version 2 along with this program; If not, see
18 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
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21 * CA 95054 USA or visit www.sun.com if you need additional information or
27 * Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
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30 * Copyright (c) 2010, 2012, Intel Corporation.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/obdecho/echo.c
38 * Author: Peter Braam <braam@clusterfs.com>
39 * Author: Andreas Dilger <adilger@clusterfs.com>
42 #define DEBUG_SUBSYSTEM S_ECHO
44 #include <obd_support.h>
45 #include <obd_class.h>
46 #include <lustre_debug.h>
47 #include <lustre_dlm.h>
48 #include <lprocfs_status.h>
50 #include "echo_internal.h"
52 /* The echo objid needs to be below 2^32, because regular FID numbers are
53 * limited to 2^32 objects in f_oid for the FID_SEQ_ECHO range. b=23335 */
54 #define ECHO_INIT_OID 0x10000000ULL
55 #define ECHO_HANDLE_MAGIC 0xabcd0123fedc9876ULL
57 #define ECHO_PERSISTENT_PAGES (ECHO_PERSISTENT_SIZE >> PAGE_CACHE_SHIFT)
58 static struct page *echo_persistent_pages[ECHO_PERSISTENT_PAGES];
61 LPROC_ECHO_READ_BYTES = 1,
62 LPROC_ECHO_WRITE_BYTES = 2,
63 LPROC_ECHO_LAST = LPROC_ECHO_WRITE_BYTES +1
66 static int echo_connect(const struct lu_env *env,
67 struct obd_export **exp, struct obd_device *obd,
68 struct obd_uuid *cluuid, struct obd_connect_data *data,
71 struct lustre_handle conn = { 0 };
74 data->ocd_connect_flags &= ECHO_CONNECT_SUPPORTED;
75 rc = class_connect(&conn, obd, cluuid);
77 CERROR("can't connect %d\n", rc);
80 *exp = class_conn2export(&conn);
85 static int echo_disconnect(struct obd_export *exp)
87 LASSERT (exp != NULL);
89 return server_disconnect_export(exp);
92 static int echo_init_export(struct obd_export *exp)
94 return ldlm_init_export(exp);
97 static int echo_destroy_export(struct obd_export *exp)
99 target_destroy_export(exp);
100 ldlm_destroy_export(exp);
105 static __u64 echo_next_id(struct obd_device *obddev)
109 spin_lock(&obddev->u.echo.eo_lock);
110 id = ++obddev->u.echo.eo_lastino;
111 spin_unlock(&obddev->u.echo.eo_lock);
116 static int echo_create(const struct lu_env *env, struct obd_export *exp,
117 struct obdo *oa, struct lov_stripe_md **ea,
118 struct obd_trans_info *oti)
120 struct obd_device *obd = class_exp2obd(exp);
123 CERROR("invalid client cookie "LPX64"\n",
124 exp->exp_handle.h_cookie);
128 if (!(oa->o_mode && S_IFMT)) {
129 CERROR("echo obd: no type!\n");
133 if (!(oa->o_valid & OBD_MD_FLTYPE)) {
134 CERROR("invalid o_valid "LPX64"\n", oa->o_valid);
138 ostid_set_seq_echo(&oa->o_oi);
139 ostid_set_id(&oa->o_oi, echo_next_id(obd));
140 oa->o_valid = OBD_MD_FLID;
145 static int echo_destroy(const struct lu_env *env, struct obd_export *exp,
146 struct obdo *oa, struct lov_stripe_md *ea,
147 struct obd_trans_info *oti, struct obd_export *md_exp,
150 struct obd_device *obd = class_exp2obd(exp);
153 CERROR("invalid client cookie "LPX64"\n",
154 exp->exp_handle.h_cookie);
158 if (!(oa->o_valid & OBD_MD_FLID)) {
159 CERROR("obdo missing FLID valid flag: "LPX64"\n", oa->o_valid);
163 if (ostid_id(&oa->o_oi) > obd->u.echo.eo_lastino ||
164 ostid_id(&oa->o_oi) < ECHO_INIT_OID) {
165 CERROR("bad destroy objid: "DOSTID"\n", POSTID(&oa->o_oi));
172 static int echo_getattr(const struct lu_env *env, struct obd_export *exp,
173 struct obd_info *oinfo)
175 struct obd_device *obd = class_exp2obd(exp);
176 obd_id id = ostid_id(&oinfo->oi_oa->o_oi);
179 CERROR("invalid client cookie "LPX64"\n",
180 exp->exp_handle.h_cookie);
184 if (!(oinfo->oi_oa->o_valid & OBD_MD_FLID)) {
185 CERROR("obdo missing FLID valid flag: "LPX64"\n",
186 oinfo->oi_oa->o_valid);
190 obdo_cpy_md(oinfo->oi_oa, &obd->u.echo.eo_oa, oinfo->oi_oa->o_valid);
191 ostid_set_seq_echo(&oinfo->oi_oa->o_oi);
192 ostid_set_id(&oinfo->oi_oa->o_oi, id);
197 static int echo_setattr(const struct lu_env *env, struct obd_export *exp,
198 struct obd_info *oinfo, struct obd_trans_info *oti)
200 struct obd_device *obd = class_exp2obd(exp);
203 CERROR("invalid client cookie "LPX64"\n",
204 exp->exp_handle.h_cookie);
208 if (!(oinfo->oi_oa->o_valid & OBD_MD_FLID)) {
209 CERROR("obdo missing FLID valid flag: "LPX64"\n",
210 oinfo->oi_oa->o_valid);
214 memcpy(&obd->u.echo.eo_oa, oinfo->oi_oa, sizeof(*oinfo->oi_oa));
216 if (ostid_id(&oinfo->oi_oa->o_oi) & 4) {
217 /* Save lock to force ACKed reply */
218 ldlm_lock_addref (&obd->u.echo.eo_nl_lock, LCK_NL);
219 oti->oti_ack_locks[0].mode = LCK_NL;
220 oti->oti_ack_locks[0].lock = obd->u.echo.eo_nl_lock;
227 echo_page_debug_setup(struct page *page, int rw, obd_id id,
228 __u64 offset, int len)
230 int page_offset = offset & ~CFS_PAGE_MASK;
231 char *addr = ((char *)kmap(page)) + page_offset;
233 if (len % OBD_ECHO_BLOCK_SIZE != 0)
234 CERROR("Unexpected block size %d\n", len);
237 if (rw & OBD_BRW_READ)
238 block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE,
241 block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE,
242 0xecc0ecc0ecc0ecc0ULL,
243 0xecc0ecc0ecc0ecc0ULL);
245 addr += OBD_ECHO_BLOCK_SIZE;
246 offset += OBD_ECHO_BLOCK_SIZE;
247 len -= OBD_ECHO_BLOCK_SIZE;
254 echo_page_debug_check(struct page *page, obd_id id,
255 __u64 offset, int len)
257 int page_offset = offset & ~CFS_PAGE_MASK;
258 char *addr = ((char *)kmap(page)) + page_offset;
262 if (len % OBD_ECHO_BLOCK_SIZE != 0)
263 CERROR("Unexpected block size %d\n", len);
266 rc2 = block_debug_check("echo", addr, OBD_ECHO_BLOCK_SIZE,
269 if (rc2 != 0 && rc == 0)
272 addr += OBD_ECHO_BLOCK_SIZE;
273 offset += OBD_ECHO_BLOCK_SIZE;
274 len -= OBD_ECHO_BLOCK_SIZE;
282 /* This allows us to verify that desc_private is passed unmolested */
283 #define DESC_PRIV 0x10293847
285 static int echo_map_nb_to_lb(struct obdo *oa, struct obd_ioobj *obj,
286 struct niobuf_remote *nb, int *pages,
287 struct niobuf_local *lb, int cmd, int *left)
289 int gfp_mask = (ostid_id(&obj->ioo_oid) & 1) ?
290 GFP_HIGHUSER : GFP_IOFS;
291 int ispersistent = ostid_id(&obj->ioo_oid) == ECHO_PERSISTENT_OBJID;
292 int debug_setup = (!ispersistent &&
293 (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
294 (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
295 struct niobuf_local *res = lb;
296 obd_off offset = nb->offset;
300 int plen = PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1));
304 /* check for local buf overflow */
308 res->lnb_file_offset = offset;
310 LASSERT((res->lnb_file_offset & ~CFS_PAGE_MASK) + res->len <=
314 ((res->lnb_file_offset >> PAGE_CACHE_SHIFT) <
315 ECHO_PERSISTENT_PAGES)) {
317 echo_persistent_pages[res->lnb_file_offset >>
319 /* Take extra ref so __free_pages() can be called OK */
320 get_page (res->page);
322 OBD_PAGE_ALLOC(res->page, gfp_mask);
323 if (res->page == NULL) {
324 CERROR("can't get page for id " DOSTID"\n",
325 POSTID(&obj->ioo_oid));
330 CDEBUG(D_PAGE, "$$$$ get page %p @ "LPU64" for %d\n",
331 res->page, res->lnb_file_offset, res->len);
333 if (cmd & OBD_BRW_READ)
337 echo_page_debug_setup(res->page, cmd,
338 ostid_id(&obj->ioo_oid),
339 res->lnb_file_offset, res->len);
352 static int echo_finalize_lb(struct obdo *oa, struct obd_ioobj *obj,
353 struct niobuf_remote *rb, int *pgs,
354 struct niobuf_local *lb, int verify)
356 struct niobuf_local *res = lb;
357 obd_off start = rb->offset >> PAGE_CACHE_SHIFT;
358 obd_off end = (rb->offset + rb->len + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
359 int count = (int)(end - start);
363 for (i = 0; i < count; i++, (*pgs) ++, res++) {
364 struct page *page = res->page;
368 CERROR("null page objid "LPU64":%p, buf %d/%d\n",
369 ostid_id(&obj->ioo_oid), page, i,
376 CDEBUG(D_PAGE, "$$$$ use page %p, addr %p@"LPU64"\n",
377 res->page, addr, res->lnb_file_offset);
380 int vrc = echo_page_debug_check(page,
381 ostid_id(&obj->ioo_oid),
382 res->lnb_file_offset,
384 /* check all the pages always */
385 if (vrc != 0 && rc == 0)
390 /* NB see comment above regarding persistent pages */
397 static int echo_preprw(const struct lu_env *env, int cmd,
398 struct obd_export *export, struct obdo *oa,
399 int objcount, struct obd_ioobj *obj,
400 struct niobuf_remote *nb, int *pages,
401 struct niobuf_local *res, struct obd_trans_info *oti,
402 struct lustre_capa *unused)
404 struct obd_device *obd;
409 obd = export->exp_obd;
413 /* Temp fix to stop falling foul of osc_announce_cached() */
414 oa->o_valid &= ~(OBD_MD_FLBLOCKS | OBD_MD_FLGRANT);
416 memset(res, 0, sizeof(*res) * *pages);
418 CDEBUG(D_PAGE, "%s %d obdos with %d IOs\n",
419 cmd == OBD_BRW_READ ? "reading" : "writing", objcount, *pages);
422 oti->oti_handle = (void *)DESC_PRIV;
427 for (i = 0; i < objcount; i++, obj++) {
430 for (j = 0 ; j < obj->ioo_bufcnt ; j++, nb++) {
432 rc = echo_map_nb_to_lb(oa, obj, nb, pages,
433 res + *pages, cmd, &left);
435 GOTO(preprw_cleanup, rc);
437 tot_bytes += nb->len;
441 atomic_add(*pages, &obd->u.echo.eo_prep);
443 if (cmd & OBD_BRW_READ)
444 lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_READ_BYTES,
447 lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
450 CDEBUG(D_PAGE, "%d pages allocated after prep\n",
451 atomic_read(&obd->u.echo.eo_prep));
456 /* It is possible that we would rather handle errors by allow
457 * any already-set-up pages to complete, rather than tearing them
458 * all down again. I believe that this is what the in-kernel
459 * prep/commit operations do.
461 CERROR("cleaning up %u pages (%d obdos)\n", *pages, objcount);
462 for (i = 0; i < *pages; i++) {
464 /* NB if this is a persistent page, __free_pages will just
465 * lose the extra ref gained above */
466 OBD_PAGE_FREE(res[i].page);
468 atomic_dec(&obd->u.echo.eo_prep);
474 static int echo_commitrw(const struct lu_env *env, int cmd,
475 struct obd_export *export, struct obdo *oa,
476 int objcount, struct obd_ioobj *obj,
477 struct niobuf_remote *rb, int niocount,
478 struct niobuf_local *res, struct obd_trans_info *oti,
481 struct obd_device *obd;
485 obd = export->exp_obd;
490 GOTO(commitrw_cleanup, rc);
492 if ((cmd & OBD_BRW_RWMASK) == OBD_BRW_READ) {
493 CDEBUG(D_PAGE, "reading %d obdos with %d IOs\n",
496 CDEBUG(D_PAGE, "writing %d obdos with %d IOs\n",
500 if (niocount && res == NULL) {
501 CERROR("NULL res niobuf with niocount %d\n", niocount);
505 LASSERT(oti == NULL || oti->oti_handle == (void *)DESC_PRIV);
507 for (i = 0; i < objcount; i++, obj++) {
508 int verify = (rc == 0 &&
509 ostid_id(&obj->ioo_oid) != ECHO_PERSISTENT_OBJID &&
510 (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
511 (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
514 for (j = 0 ; j < obj->ioo_bufcnt ; j++, rb++) {
515 int vrc = echo_finalize_lb(oa, obj, rb, &pgs, &res[pgs],
521 GOTO(commitrw_cleanup, rc = vrc);
529 atomic_sub(pgs, &obd->u.echo.eo_prep);
531 CDEBUG(D_PAGE, "%d pages remain after commit\n",
532 atomic_read(&obd->u.echo.eo_prep));
536 atomic_sub(pgs, &obd->u.echo.eo_prep);
538 CERROR("cleaning up %d pages (%d obdos)\n",
539 niocount - pgs - 1, objcount);
541 while (pgs < niocount) {
542 struct page *page = res[pgs++].page;
547 /* NB see comment above regarding persistent pages */
549 atomic_dec(&obd->u.echo.eo_prep);
554 static int echo_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
556 struct lprocfs_static_vars lvars;
558 __u64 lock_flags = 0;
559 struct ldlm_res_id res_id = {.name = {1}};
562 obd->u.echo.eo_obt.obt_magic = OBT_MAGIC;
563 spin_lock_init(&obd->u.echo.eo_lock);
564 obd->u.echo.eo_lastino = ECHO_INIT_OID;
566 sprintf(ns_name, "echotgt-%s", obd->obd_uuid.uuid);
567 obd->obd_namespace = ldlm_namespace_new(obd, ns_name,
568 LDLM_NAMESPACE_SERVER,
569 LDLM_NAMESPACE_MODEST,
571 if (obd->obd_namespace == NULL) {
576 rc = ldlm_cli_enqueue_local(obd->obd_namespace, &res_id, LDLM_PLAIN,
577 NULL, LCK_NL, &lock_flags, NULL,
578 ldlm_completion_ast, NULL, NULL, 0,
579 LVB_T_NONE, NULL, &obd->u.echo.eo_nl_lock);
580 LASSERT (rc == ELDLM_OK);
582 lprocfs_echo_init_vars(&lvars);
583 if (lprocfs_obd_setup(obd, lvars.obd_vars) == 0 &&
584 lprocfs_alloc_obd_stats(obd, LPROC_ECHO_LAST) == 0) {
585 lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_READ_BYTES,
586 LPROCFS_CNTR_AVGMINMAX,
587 "read_bytes", "bytes");
588 lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
589 LPROCFS_CNTR_AVGMINMAX,
590 "write_bytes", "bytes");
593 ptlrpc_init_client (LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
594 "echo_ldlm_cb_client", &obd->obd_ldlm_client);
598 static int echo_cleanup(struct obd_device *obd)
602 lprocfs_obd_cleanup(obd);
603 lprocfs_free_obd_stats(obd);
605 ldlm_lock_decref(&obd->u.echo.eo_nl_lock, LCK_NL);
607 /* XXX Bug 3413; wait for a bit to ensure the BL callback has
608 * happened before calling ldlm_namespace_free() */
609 schedule_timeout_and_set_state(TASK_UNINTERRUPTIBLE, cfs_time_seconds(1));
611 ldlm_namespace_free(obd->obd_namespace, NULL, obd->obd_force);
612 obd->obd_namespace = NULL;
614 leaked = atomic_read(&obd->u.echo.eo_prep);
616 CERROR("%d prep/commitrw pages leaked\n", leaked);
621 struct obd_ops echo_obd_ops = {
622 .o_owner = THIS_MODULE,
623 .o_connect = echo_connect,
624 .o_disconnect = echo_disconnect,
625 .o_init_export = echo_init_export,
626 .o_destroy_export = echo_destroy_export,
627 .o_create = echo_create,
628 .o_destroy = echo_destroy,
629 .o_getattr = echo_getattr,
630 .o_setattr = echo_setattr,
631 .o_preprw = echo_preprw,
632 .o_commitrw = echo_commitrw,
633 .o_setup = echo_setup,
634 .o_cleanup = echo_cleanup
637 void echo_persistent_pages_fini(void)
641 for (i = 0; i < ECHO_PERSISTENT_PAGES; i++)
642 if (echo_persistent_pages[i] != NULL) {
643 OBD_PAGE_FREE(echo_persistent_pages[i]);
644 echo_persistent_pages[i] = NULL;
648 int echo_persistent_pages_init(void)
653 for (i = 0; i < ECHO_PERSISTENT_PAGES; i++) {
654 int gfp_mask = (i < ECHO_PERSISTENT_PAGES/2) ?
655 GFP_IOFS : GFP_HIGHUSER;
657 OBD_PAGE_ALLOC(pg, gfp_mask);
659 echo_persistent_pages_fini ();
663 memset (kmap (pg), 0, PAGE_CACHE_SIZE);
666 echo_persistent_pages[i] = pg;