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.sun.com/software/products/lustre/docs/GPLv2.pdf
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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.
28 * Use is subject to license terms.
30 * Copyright (c) 2010, 2014, 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)
101 target_destroy_export(exp);
102 ldlm_destroy_export(exp);
107 static u64 echo_next_id(struct obd_device *obddev)
111 spin_lock(&obddev->u.echo.eo_lock);
112 id = ++obddev->u.echo.eo_lastino;
113 spin_unlock(&obddev->u.echo.eo_lock);
118 static int echo_create(const struct lu_env *env, struct obd_export *exp,
121 struct obd_device *obd = class_exp2obd(exp);
124 CERROR("invalid client cookie "LPX64"\n",
125 exp->exp_handle.h_cookie);
129 if (!(oa->o_mode & S_IFMT)) {
130 CERROR("echo obd: no type!\n");
134 if (!(oa->o_valid & OBD_MD_FLTYPE)) {
135 CERROR("invalid o_valid "LPX64"\n", oa->o_valid);
139 ostid_set_seq_echo(&oa->o_oi);
140 ostid_set_id(&oa->o_oi, echo_next_id(obd));
141 oa->o_valid = OBD_MD_FLID;
146 static int echo_destroy(const struct lu_env *env, struct obd_export *exp,
149 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 u64 id = ostid_id(&oinfo->oi_oa->o_oi);
180 CERROR("invalid client cookie "LPX64"\n",
181 exp->exp_handle.h_cookie);
185 if (!(oinfo->oi_oa->o_valid & OBD_MD_FLID)) {
186 CERROR("obdo missing FLID valid flag: "LPX64"\n",
187 oinfo->oi_oa->o_valid);
191 obdo_cpy_md(oinfo->oi_oa, &obd->u.echo.eo_oa, oinfo->oi_oa->o_valid);
192 ostid_set_seq_echo(&oinfo->oi_oa->o_oi);
193 ostid_set_id(&oinfo->oi_oa->o_oi, id);
198 static int echo_setattr(const struct lu_env *env, struct obd_export *exp,
199 struct obd_info *oinfo)
201 struct obd_device *obd = class_exp2obd(exp);
205 CERROR("invalid client cookie "LPX64"\n",
206 exp->exp_handle.h_cookie);
210 if (!(oinfo->oi_oa->o_valid & OBD_MD_FLID)) {
211 CERROR("obdo missing FLID valid flag: "LPX64"\n",
212 oinfo->oi_oa->o_valid);
216 memcpy(&obd->u.echo.eo_oa, oinfo->oi_oa, sizeof(*oinfo->oi_oa));
222 echo_page_debug_setup(struct page *page, int rw, u64 id,
223 __u64 offset, int len)
225 int page_offset = offset & ~PAGE_MASK;
226 char *addr = ((char *)kmap(page)) + page_offset;
228 if (len % OBD_ECHO_BLOCK_SIZE != 0)
229 CERROR("Unexpected block size %d\n", len);
232 if (rw & OBD_BRW_READ)
233 block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE,
236 block_debug_setup(addr, OBD_ECHO_BLOCK_SIZE,
237 0xecc0ecc0ecc0ecc0ULL,
238 0xecc0ecc0ecc0ecc0ULL);
240 addr += OBD_ECHO_BLOCK_SIZE;
241 offset += OBD_ECHO_BLOCK_SIZE;
242 len -= OBD_ECHO_BLOCK_SIZE;
249 echo_page_debug_check(struct page *page, u64 id,
250 __u64 offset, int len)
252 int page_offset = offset & ~PAGE_MASK;
253 char *addr = ((char *)kmap(page)) + page_offset;
257 if (len % OBD_ECHO_BLOCK_SIZE != 0)
258 CERROR("Unexpected block size %d\n", len);
261 rc2 = block_debug_check("echo", addr, OBD_ECHO_BLOCK_SIZE,
264 if (rc2 != 0 && rc == 0)
267 addr += OBD_ECHO_BLOCK_SIZE;
268 offset += OBD_ECHO_BLOCK_SIZE;
269 len -= OBD_ECHO_BLOCK_SIZE;
277 static int echo_map_nb_to_lb(struct obdo *oa, struct obd_ioobj *obj,
278 struct niobuf_remote *nb, int *pages,
279 struct niobuf_local *lb, int cmd, int *left)
281 gfp_t gfp_mask = (ostid_id(&obj->ioo_oid) & 1) ?
282 GFP_HIGHUSER : GFP_IOFS;
283 int ispersistent = ostid_id(&obj->ioo_oid) == ECHO_PERSISTENT_OBJID;
284 int debug_setup = (!ispersistent &&
285 (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
286 (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
287 struct niobuf_local *res = lb;
288 u64 offset = nb->rnb_offset;
289 int len = nb->rnb_len;
292 int plen = PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1));
296 /* check for local buf overflow */
300 res->lnb_file_offset = offset;
302 LASSERT((res->lnb_file_offset & ~PAGE_MASK) +
303 res->lnb_len <= PAGE_CACHE_SIZE);
306 ((res->lnb_file_offset >> PAGE_CACHE_SHIFT) <
307 ECHO_PERSISTENT_PAGES)) {
309 echo_persistent_pages[res->lnb_file_offset >>
311 /* Take extra ref so __free_pages() can be called OK */
312 get_page(res->lnb_page);
314 OBD_PAGE_ALLOC(res->lnb_page, gfp_mask);
315 if (res->lnb_page == NULL) {
316 CERROR("can't get page for id " DOSTID"\n",
317 POSTID(&obj->ioo_oid));
322 CDEBUG(D_PAGE, "$$$$ get page %p @ "LPU64" for %d\n",
323 res->lnb_page, res->lnb_file_offset, res->lnb_len);
325 if (cmd & OBD_BRW_READ)
326 res->lnb_rc = res->lnb_len;
329 echo_page_debug_setup(res->lnb_page, cmd,
330 ostid_id(&obj->ioo_oid),
331 res->lnb_file_offset,
345 static int echo_finalize_lb(struct obdo *oa, struct obd_ioobj *obj,
346 struct niobuf_remote *rb, int *pgs,
347 struct niobuf_local *lb, int verify)
349 struct niobuf_local *res = lb;
350 u64 start = rb->rnb_offset >> PAGE_CACHE_SHIFT;
351 u64 end = (rb->rnb_offset + rb->rnb_len + PAGE_CACHE_SIZE - 1) >>
353 int count = (int)(end - start);
357 for (i = 0; i < count; i++, (*pgs) ++, res++) {
358 struct page *page = res->lnb_page;
362 CERROR("null page objid "LPU64":%p, buf %d/%d\n",
363 ostid_id(&obj->ioo_oid), page, i,
370 CDEBUG(D_PAGE, "$$$$ use page %p, addr %p@"LPU64"\n",
371 res->lnb_page, addr, res->lnb_file_offset);
374 int vrc = echo_page_debug_check(page,
375 ostid_id(&obj->ioo_oid),
376 res->lnb_file_offset,
378 /* check all the pages always */
379 if (vrc != 0 && rc == 0)
384 /* NB see comment above regarding persistent pages */
391 static int echo_preprw(const struct lu_env *env, int cmd,
392 struct obd_export *export, struct obdo *oa,
393 int objcount, struct obd_ioobj *obj,
394 struct niobuf_remote *nb, int *pages,
395 struct niobuf_local *res)
397 struct obd_device *obd;
403 obd = export->exp_obd;
407 /* Temp fix to stop falling foul of osc_announce_cached() */
408 oa->o_valid &= ~(OBD_MD_FLBLOCKS | OBD_MD_FLGRANT);
410 memset(res, 0, sizeof(*res) * *pages);
412 CDEBUG(D_PAGE, "%s %d obdos with %d IOs\n",
413 cmd == OBD_BRW_READ ? "reading" : "writing", objcount, *pages);
418 for (i = 0; i < objcount; i++, obj++) {
421 for (j = 0 ; j < obj->ioo_bufcnt ; j++, nb++) {
423 rc = echo_map_nb_to_lb(oa, obj, nb, pages,
424 res + *pages, cmd, &left);
426 GOTO(preprw_cleanup, rc);
428 tot_bytes += nb->rnb_len;
432 atomic_add(*pages, &obd->u.echo.eo_prep);
434 if (cmd & OBD_BRW_READ)
435 lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_READ_BYTES,
438 lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
441 CDEBUG(D_PAGE, "%d pages allocated after prep\n",
442 atomic_read(&obd->u.echo.eo_prep));
447 /* It is possible that we would rather handle errors by allow
448 * any already-set-up pages to complete, rather than tearing them
449 * all down again. I believe that this is what the in-kernel
450 * prep/commit operations do.
452 CERROR("cleaning up %u pages (%d obdos)\n", *pages, objcount);
453 for (i = 0; i < *pages; i++) {
454 kunmap(res[i].lnb_page);
455 /* NB if this is a persistent page, __free_pages will just
456 * lose the extra ref gained above */
457 OBD_PAGE_FREE(res[i].lnb_page);
458 res[i].lnb_page = NULL;
459 atomic_dec(&obd->u.echo.eo_prep);
465 static int echo_commitrw(const struct lu_env *env, int cmd,
466 struct obd_export *export, struct obdo *oa,
467 int objcount, struct obd_ioobj *obj,
468 struct niobuf_remote *rb, int niocount,
469 struct niobuf_local *res, int rc)
471 struct obd_device *obd;
476 obd = export->exp_obd;
481 GOTO(commitrw_cleanup, rc);
483 if ((cmd & OBD_BRW_RWMASK) == OBD_BRW_READ) {
484 CDEBUG(D_PAGE, "reading %d obdos with %d IOs\n",
487 CDEBUG(D_PAGE, "writing %d obdos with %d IOs\n",
491 if (niocount && res == NULL) {
492 CERROR("NULL res niobuf with niocount %d\n", niocount);
496 for (i = 0; i < objcount; i++, obj++) {
497 int verify = (rc == 0 &&
498 ostid_id(&obj->ioo_oid) != ECHO_PERSISTENT_OBJID &&
499 (oa->o_valid & OBD_MD_FLFLAGS) != 0 &&
500 (oa->o_flags & OBD_FL_DEBUG_CHECK) != 0);
503 for (j = 0 ; j < obj->ioo_bufcnt ; j++, rb++) {
504 int vrc = echo_finalize_lb(oa, obj, rb, &pgs, &res[pgs],
510 GOTO(commitrw_cleanup, rc = vrc);
518 atomic_sub(pgs, &obd->u.echo.eo_prep);
520 CDEBUG(D_PAGE, "%d pages remain after commit\n",
521 atomic_read(&obd->u.echo.eo_prep));
525 atomic_sub(pgs, &obd->u.echo.eo_prep);
527 CERROR("cleaning up %d pages (%d obdos)\n",
528 niocount - pgs - 1, objcount);
530 while (pgs < niocount) {
531 struct page *page = res[pgs++].lnb_page;
536 /* NB see comment above regarding persistent pages */
538 atomic_dec(&obd->u.echo.eo_prep);
543 LPROC_SEQ_FOPS_RO_TYPE(echo, uuid);
544 static struct lprocfs_vars lprocfs_echo_obd_vars[] = {
546 .fops = &echo_uuid_fops },
550 static int echo_setup(struct obd_device *obd, struct lustre_cfg *lcfg)
553 __u64 lock_flags = 0;
554 struct ldlm_res_id res_id = {.name = {1}};
558 obd->u.echo.eo_obt.obt_magic = OBT_MAGIC;
559 spin_lock_init(&obd->u.echo.eo_lock);
560 obd->u.echo.eo_lastino = ECHO_INIT_OID;
562 sprintf(ns_name, "echotgt-%s", obd->obd_uuid.uuid);
563 obd->obd_namespace = ldlm_namespace_new(obd, ns_name,
564 LDLM_NAMESPACE_SERVER,
565 LDLM_NAMESPACE_MODEST,
567 if (obd->obd_namespace == NULL) {
572 rc = ldlm_cli_enqueue_local(obd->obd_namespace, &res_id, LDLM_PLAIN,
573 NULL, LCK_NL, &lock_flags, NULL,
574 ldlm_completion_ast, NULL, NULL, 0,
575 LVB_T_NONE, NULL, &obd->u.echo.eo_nl_lock);
576 LASSERT (rc == ELDLM_OK);
578 obd->obd_vars = lprocfs_echo_obd_vars;
579 if (lprocfs_obd_setup(obd) == 0 &&
580 lprocfs_alloc_obd_stats(obd, LPROC_ECHO_LAST) == 0) {
581 lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_READ_BYTES,
582 LPROCFS_CNTR_AVGMINMAX,
583 "read_bytes", "bytes");
584 lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
585 LPROCFS_CNTR_AVGMINMAX,
586 "write_bytes", "bytes");
589 ptlrpc_init_client(LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
590 "echo_ldlm_cb_client", &obd->obd_ldlm_client);
594 static int echo_cleanup(struct obd_device *obd)
599 lprocfs_obd_cleanup(obd);
600 lprocfs_free_obd_stats(obd);
602 ldlm_lock_decref(&obd->u.echo.eo_nl_lock, LCK_NL);
604 /* XXX Bug 3413; wait for a bit to ensure the BL callback has
605 * happened before calling ldlm_namespace_free() */
606 set_current_state(TASK_UNINTERRUPTIBLE);
607 schedule_timeout(cfs_time_seconds(1));
609 ldlm_namespace_free(obd->obd_namespace, NULL, obd->obd_force);
610 obd->obd_namespace = NULL;
612 leaked = atomic_read(&obd->u.echo.eo_prep);
614 CERROR("%d prep/commitrw pages leaked\n", leaked);
619 struct obd_ops echo_obd_ops = {
620 .o_owner = THIS_MODULE,
621 .o_connect = echo_connect,
622 .o_disconnect = echo_disconnect,
623 .o_init_export = echo_init_export,
624 .o_destroy_export = echo_destroy_export,
625 .o_create = echo_create,
626 .o_destroy = echo_destroy,
627 .o_getattr = echo_getattr,
628 .o_setattr = echo_setattr,
629 .o_preprw = echo_preprw,
630 .o_commitrw = echo_commitrw,
631 .o_setup = echo_setup,
632 .o_cleanup = echo_cleanup
635 void echo_persistent_pages_fini(void)
639 for (i = 0; i < ECHO_PERSISTENT_PAGES; i++)
640 if (echo_persistent_pages[i] != NULL) {
641 OBD_PAGE_FREE(echo_persistent_pages[i]);
642 echo_persistent_pages[i] = NULL;
646 int echo_persistent_pages_init(void)
651 for (i = 0; i < ECHO_PERSISTENT_PAGES; i++) {
652 gfp_t gfp_mask = (i < ECHO_PERSISTENT_PAGES/2) ?
653 GFP_IOFS : GFP_HIGHUSER;
655 OBD_PAGE_ALLOC(pg, gfp_mask);
657 echo_persistent_pages_fini();
661 memset (kmap (pg), 0, PAGE_CACHE_SIZE);
664 echo_persistent_pages[i] = pg;