1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (c) 2001-2003 Cluster File Systems, Inc.
5 * Author: Peter Braam <braam@clusterfs.com>
6 * Author: Andreas Dilger <adilger@clusterfs.com>
8 * This file is part of Lustre, http://www.lustre.org.
10 * Lustre is free software; you can redistribute it and/or
11 * modify it under the terms of version 2 of the GNU General Public
12 * License as published by the Free Software Foundation.
14 * Lustre is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with Lustre; if not, write to the Free Software
21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 #include <linux/version.h>
27 #include <linux/module.h>
29 #include <linux/highmem.h>
31 #include <linux/stat.h>
32 #include <linux/sched.h>
33 #include <linux/smp_lock.h>
34 #include <linux/ext2_fs.h>
35 #include <linux/quotaops.h>
36 #include <linux/proc_fs.h>
37 #include <linux/init.h>
38 #include <asm/unistd.h>
40 #define DEBUG_SUBSYSTEM S_ECHO
42 #include <linux/obd_support.h>
43 #include <linux/obd_class.h>
44 #include <linux/obd_echo.h>
45 #include <linux/lustre_debug.h>
46 #include <linux/lustre_dlm.h>
47 #include <linux/lprocfs_status.h>
49 #define ECHO_INIT_OBJID 0x1000000000000000ULL
50 #define ECHO_HANDLE_MAGIC 0xabcd0123fedc9876ULL
52 #define ECHO_OBJECT0_NPAGES 16
53 static struct page *echo_object0_pages[ECHO_OBJECT0_NPAGES];
56 LPROC_ECHO_READ_BYTES = 1,
57 LPROC_ECHO_WRITE_BYTES = 2,
58 LPROC_ECHO_LAST = LPROC_ECHO_WRITE_BYTES +1
61 static int echo_connect(struct lustre_handle *conn, struct obd_device *obd,
62 struct obd_uuid *cluuid)
64 return class_connect(conn, obd, cluuid);
67 static int echo_disconnect(struct lustre_handle *conn, int flags)
69 struct obd_export *exp = class_conn2export(conn);
71 LASSERT (exp != NULL);
73 ldlm_cancel_locks_for_export(exp);
74 class_export_put(exp);
75 return class_disconnect(conn, flags);
78 static __u64 echo_next_id(struct obd_device *obddev)
82 spin_lock(&obddev->u.echo.eo_lock);
83 id = ++obddev->u.echo.eo_lastino;
84 spin_unlock(&obddev->u.echo.eo_lock);
89 int echo_create(struct lustre_handle *conn, struct obdo *oa,
90 struct lov_stripe_md **ea, struct obd_trans_info *oti)
92 struct obd_device *obd = class_conn2obd(conn);
95 CERROR("invalid client cookie "LPX64"\n", conn->cookie);
99 if (!(oa->o_mode && S_IFMT)) {
100 CERROR("echo obd: no type!\n");
104 if (!(oa->o_valid & OBD_MD_FLTYPE)) {
105 CERROR("invalid o_valid %08x\n", oa->o_valid);
109 oa->o_id = echo_next_id(obd);
110 oa->o_valid = OBD_MD_FLID;
111 atomic_inc(&obd->u.echo.eo_create);
116 int echo_destroy(struct lustre_handle *conn, struct obdo *oa,
117 struct lov_stripe_md *ea, struct obd_trans_info *oti)
119 struct obd_device *obd = class_conn2obd(conn);
122 CERROR("invalid client cookie "LPX64"\n", conn->cookie);
126 if (!(oa->o_valid & OBD_MD_FLID)) {
127 CERROR("obdo missing FLID valid flag: %08x\n", oa->o_valid);
131 if (oa->o_id > obd->u.echo.eo_lastino || oa->o_id < ECHO_INIT_OBJID) {
132 CERROR("bad destroy objid: "LPX64"\n", oa->o_id);
136 atomic_inc(&obd->u.echo.eo_destroy);
141 static int echo_open(struct lustre_handle *conn, struct obdo *oa,
142 struct lov_stripe_md *md, struct obd_trans_info *oti,
143 struct obd_client_handle *och)
145 struct lustre_handle *fh = obdo_handle (oa);
146 struct obd_device *obd = class_conn2obd (conn);
149 CERROR("invalid client cookie "LPX64"\n", conn->cookie);
153 if (!(oa->o_valid & OBD_MD_FLID)) {
154 CERROR ("obdo missing FLID valid flag: %08x\n", oa->o_valid);
158 fh->cookie = ECHO_HANDLE_MAGIC;
160 oa->o_valid |= OBD_MD_FLHANDLE;
164 static int echo_close(struct lustre_handle *conn, struct obdo *oa,
165 struct lov_stripe_md *md, struct obd_trans_info *oti)
167 struct lustre_handle *fh = obdo_handle (oa);
168 struct obd_device *obd = class_conn2obd(conn);
171 CERROR("invalid client cookie "LPX64"\n", conn->cookie);
175 if (!(oa->o_valid & OBD_MD_FLHANDLE)) {
176 CERROR("obdo missing FLHANDLE valid flag: %08x\n", oa->o_valid);
180 if (fh->cookie != ECHO_HANDLE_MAGIC) {
181 CERROR ("invalid file handle on close: "LPX64"\n", fh->cookie);
188 static int echo_getattr(struct lustre_handle *conn, struct obdo *oa,
189 struct lov_stripe_md *md)
191 struct obd_device *obd = class_conn2obd(conn);
192 obd_id id = oa->o_id;
195 CERROR("invalid client cookie "LPX64"\n", conn->cookie);
199 if (!(oa->o_valid & OBD_MD_FLID)) {
200 CERROR("obdo missing FLID valid flag: %08x\n", oa->o_valid);
204 obdo_cpy_md(oa, &obd->u.echo.oa, oa->o_valid);
210 static int echo_setattr(struct lustre_handle *conn, struct obdo *oa,
211 struct lov_stripe_md *md, struct obd_trans_info *oti)
213 struct obd_device *obd = class_conn2obd(conn);
216 CERROR("invalid client cookie "LPX64"\n", conn->cookie);
220 if (!(oa->o_valid & OBD_MD_FLID)) {
221 CERROR("obdo missing FLID valid flag: %08x\n", oa->o_valid);
225 memcpy(&obd->u.echo.oa, oa, sizeof(*oa));
227 atomic_inc(&obd->u.echo.eo_setattr);
232 /* This allows us to verify that desc_private is passed unmolested */
233 #define DESC_PRIV 0x10293847
235 int echo_preprw(int cmd, struct obd_export *export, struct obdo *oa,
236 int objcount, struct obd_ioobj *obj, int niocount,
237 struct niobuf_remote *nb, struct niobuf_local *res,
238 struct obd_trans_info *oti)
240 struct obd_device *obd;
241 struct niobuf_local *r = res;
247 obd = export->exp_obd;
251 memset(res, 0, sizeof(*res) * niocount);
253 CDEBUG(D_PAGE, "%s %d obdos with %d IOs\n",
254 cmd == OBD_BRW_READ ? "reading" : "writing", objcount, niocount);
257 oti->oti_handle = (void *)DESC_PRIV;
259 for (i = 0; i < objcount; i++, obj++) {
260 int gfp_mask = (obj->ioo_id & 1) ? GFP_HIGHUSER : GFP_KERNEL;
261 int isobj0 = obj->ioo_id == 0;
262 int verify = !isobj0;
265 for (j = 0 ; j < obj->ioo_bufcnt ; j++, nb++, r++) {
268 (nb->offset >> PAGE_SHIFT) < ECHO_OBJECT0_NPAGES) {
269 r->page = echo_object0_pages[nb->offset >>
271 /* Take extra ref so __free_pages() can be called OK */
274 r->page = alloc_pages(gfp_mask, 0);
275 if (r->page == NULL) {
276 CERROR("can't get page %u/%u for id "
278 j, obj->ioo_bufcnt, obj->ioo_id);
279 GOTO(preprw_cleanup, rc = -ENOMEM);
285 atomic_inc(&obd->u.echo.eo_prep);
287 r->offset = nb->offset;
289 LASSERT((r->offset & ~PAGE_MASK) + r->len <= PAGE_SIZE);
291 CDEBUG(D_PAGE, "$$$$ get page %p @ "LPU64" for %d\n",
292 r->page, r->offset, r->len);
294 if (cmd & OBD_BRW_READ) {
297 page_debug_setup(kmap (r->page), r->len,
298 r->offset,obj->ioo_id);
304 page_debug_setup(kmap (r->page), r->len,
312 if (cmd & OBD_BRW_READ)
313 lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_READ_BYTES,
316 lprocfs_counter_add(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
319 CDEBUG(D_PAGE, "%d pages allocated after prep\n",
320 atomic_read(&obd->u.echo.eo_prep));
325 /* It is possible that we would rather handle errors by allow
326 * any already-set-up pages to complete, rather than tearing them
327 * all down again. I believe that this is what the in-kernel
328 * prep/commit operations do.
330 CERROR("cleaning up %ld pages (%d obdos)\n", (long)(r - res), objcount);
333 /* NB if this is an 'object0' page, __free_pages will just
334 * lose the extra ref gained above */
335 __free_pages(r->page, 0);
336 atomic_dec(&obd->u.echo.eo_prep);
338 memset(res, 0, sizeof(*res) * niocount);
343 int echo_commitrw(int cmd, struct obd_export *export, struct obdo *oa,
344 int objcount, struct obd_ioobj *obj, int niocount,
345 struct niobuf_local *res, struct obd_trans_info *oti)
347 struct obd_device *obd;
348 struct niobuf_local *r = res;
349 int i, vrc = 0, rc = 0;
352 obd = export->exp_obd;
356 if ((cmd & OBD_BRW_RWMASK) == OBD_BRW_READ) {
357 CDEBUG(D_PAGE, "reading %d obdos with %d IOs\n",
360 CDEBUG(D_PAGE, "writing %d obdos with %d IOs\n",
364 if (niocount && !r) {
365 CERROR("NULL res niobuf with niocount %d\n", niocount);
369 LASSERT(oti == NULL || oti->oti_handle == (void *)DESC_PRIV);
371 for (i = 0; i < objcount; i++, obj++) {
372 int verify = obj->ioo_id != 0;
375 for (j = 0 ; j < obj->ioo_bufcnt ; j++, r++) {
376 struct page *page = r->page;
379 if (!page || !(addr = kmap(page)) ||
380 !kern_addr_valid(addr)) {
382 CERROR("bad page objid "LPU64":%p, buf %d/%d\n",
383 obj->ioo_id, page, j, obj->ioo_bufcnt);
385 GOTO(commitrw_cleanup, rc = -EFAULT);
388 CDEBUG(D_PAGE, "$$$$ use page %p, addr %p@"LPU64"\n",
389 r->page, addr, r->offset);
392 vrc = page_debug_check("echo", addr, r->len,
393 r->offset, obj->ioo_id);
394 /* check all the pages always */
395 if (vrc != 0 && rc == 0)
400 /* NB see comment above regarding object0 pages */
401 __free_pages(page, 0);
402 atomic_dec(&obd->u.echo.eo_prep);
405 CDEBUG(D_PAGE, "%d pages remain after commit\n",
406 atomic_read(&obd->u.echo.eo_prep));
410 CERROR("cleaning up %ld pages (%d obdos)\n",
411 niocount - (long)(r - res) - 1, objcount);
412 while (++r < res + niocount) {
413 struct page *page = r->page;
415 /* NB see comment above regarding object0 pages */
416 __free_pages(page, 0);
417 atomic_dec(&obd->u.echo.eo_prep);
422 static int echo_setup(struct obd_device *obddev, obd_count len, void *buf)
426 spin_lock_init(&obddev->u.echo.eo_lock);
427 obddev->u.echo.eo_lastino = ECHO_INIT_OBJID;
429 obddev->obd_namespace =
430 ldlm_namespace_new("echo-tgt", LDLM_NAMESPACE_SERVER);
431 if (obddev->obd_namespace == NULL) {
436 ptlrpc_init_client (LDLM_CB_REQUEST_PORTAL, LDLM_CB_REPLY_PORTAL,
437 "echo_ldlm_cb_client", &obddev->obd_ldlm_client);
441 static int echo_cleanup(struct obd_device *obddev, int flags)
445 ldlm_namespace_free(obddev->obd_namespace);
446 CERROR("%d prep/commitrw pages leaked\n",
447 atomic_read(&obddev->u.echo.eo_prep));
452 int echo_attach(struct obd_device *obd, obd_count len, void *data)
454 struct lprocfs_static_vars lvars;
457 lprocfs_init_vars(echo, &lvars);
458 rc = lprocfs_obd_attach(obd, lvars.obd_vars);
461 rc = lprocfs_alloc_obd_stats(obd, LPROC_ECHO_LAST);
465 lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_READ_BYTES,
466 LPROCFS_CNTR_AVGMINMAX, "read_bytes", "bytes");
467 lprocfs_counter_init(obd->obd_stats, LPROC_ECHO_WRITE_BYTES,
468 LPROCFS_CNTR_AVGMINMAX, "write_bytes", "bytes");
472 int echo_detach(struct obd_device *dev)
474 lprocfs_free_obd_stats(dev);
475 return lprocfs_obd_detach(dev);
478 static struct obd_ops echo_obd_ops = {
479 o_owner: THIS_MODULE,
480 o_attach: echo_attach,
481 o_detach: echo_detach,
482 o_connect: echo_connect,
483 o_disconnect: echo_disconnect,
484 o_create: echo_create,
485 o_destroy: echo_destroy,
488 o_getattr: echo_getattr,
489 o_setattr: echo_setattr,
490 o_preprw: echo_preprw,
491 o_commitrw: echo_commitrw,
493 o_cleanup: echo_cleanup
496 extern int echo_client_init(void);
497 extern void echo_client_cleanup(void);
500 echo_object0_pages_fini (void)
504 for (i = 0; i < ECHO_OBJECT0_NPAGES; i++)
505 if (echo_object0_pages[i] != NULL) {
506 __free_pages (echo_object0_pages[i], 0);
507 echo_object0_pages[i] = NULL;
512 echo_object0_pages_init (void)
517 for (i = 0; i < ECHO_OBJECT0_NPAGES; i++) {
518 int gfp_mask = (i < ECHO_OBJECT0_NPAGES/2) ?
519 GFP_KERNEL : GFP_HIGHUSER;
521 pg = alloc_pages (gfp_mask, 0);
523 echo_object0_pages_fini ();
527 memset (kmap (pg), 0, PAGE_SIZE);
530 echo_object0_pages[i] = pg;
536 static int __init obdecho_init(void)
538 struct lprocfs_static_vars lvars;
541 printk(KERN_INFO "Lustre Echo OBD driver; info@clusterfs.com\n");
543 lprocfs_init_vars(echo, &lvars);
545 rc = echo_object0_pages_init ();
549 rc = class_register_type(&echo_obd_ops, lvars.module_vars,
550 OBD_ECHO_DEVICENAME);
554 rc = echo_client_init();
558 class_unregister_type(OBD_ECHO_DEVICENAME);
560 echo_object0_pages_fini ();
565 static void /*__exit*/ obdecho_exit(void)
567 echo_client_cleanup();
568 class_unregister_type(OBD_ECHO_DEVICENAME);
569 echo_object0_pages_fini ();
572 MODULE_AUTHOR("Cluster File Systems, Inc. <info@clusterfs.com>");
573 MODULE_DESCRIPTION("Lustre Testing Echo OBD driver");
574 MODULE_LICENSE("GPL");
576 module_init(obdecho_init);
577 module_exit(obdecho_exit);