2 * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/kernel.h>
33 #include <sys/module.h>
35 #include <sys/mutex.h>
37 #include <sys/sysctl.h>
38 #include <sys/malloc.h>
39 #include <geom/geom.h>
40 #include <geom/nop/g_nop.h>
43 SYSCTL_DECL(_kern_geom);
44 SYSCTL_NODE(_kern_geom, OID_AUTO, nop, CTLFLAG_RW, 0, "GEOM_NOP stuff");
45 static u_int g_nop_debug = 0;
46 SYSCTL_UINT(_kern_geom_nop, OID_AUTO, debug, CTLFLAG_RW, &g_nop_debug, 0,
49 static int g_nop_destroy(struct g_geom *gp, boolean_t force);
50 static int g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp,
52 static void g_nop_config(struct gctl_req *req, struct g_class *mp,
54 static void g_nop_dumpconf(struct sbuf *sb, const char *indent,
55 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp);
57 struct g_class g_nop_class = {
58 .name = G_NOP_CLASS_NAME,
60 .ctlreq = g_nop_config,
61 .destroy_geom = g_nop_destroy_geom
66 g_nop_orphan(struct g_consumer *cp)
70 g_nop_destroy(cp->geom, 1);
74 g_nop_start(struct bio *bp)
76 struct g_nop_softc *sc;
78 struct g_provider *pp;
82 gp = bp->bio_to->geom;
84 G_NOP_LOGREQ(bp, "Request received.");
85 switch (bp->bio_cmd) {
88 sc->sc_readbytes += bp->bio_length;
89 failprob = sc->sc_rfailprob;
93 sc->sc_wrotebytes += bp->bio_length;
94 failprob = sc->sc_wfailprob;
100 rval = arc4random() % 100;
101 if (rval < failprob) {
102 G_NOP_LOGREQ(bp, "Returning error=%d.", sc->sc_error);
103 g_io_deliver(bp, sc->sc_error);
107 cbp = g_clone_bio(bp);
109 g_io_deliver(bp, ENOMEM);
112 cbp->bio_done = g_std_done;
113 cbp->bio_offset = bp->bio_offset + sc->sc_offset;
114 pp = LIST_FIRST(&gp->provider);
115 KASSERT(pp != NULL, ("NULL pp"));
117 G_NOP_LOGREQ(cbp, "Sending request.");
118 g_io_request(cbp, LIST_FIRST(&gp->consumer));
122 g_nop_access(struct g_provider *pp, int dr, int dw, int de)
125 struct g_consumer *cp;
129 cp = LIST_FIRST(&gp->consumer);
130 error = g_access(cp, dr, dw, de);
136 g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
137 int ioerror, u_int rfailprob, u_int wfailprob, off_t offset, off_t size,
140 struct g_nop_softc *sc;
142 struct g_provider *newpp;
143 struct g_consumer *cp;
153 if ((offset % pp->sectorsize) != 0) {
154 gctl_error(req, "Invalid offset for provider %s.", pp->name);
157 if ((size % pp->sectorsize) != 0) {
158 gctl_error(req, "Invalid size for provider %s.", pp->name);
161 if (offset >= pp->mediasize) {
162 gctl_error(req, "Invalid offset for provider %s.", pp->name);
166 size = pp->mediasize - offset;
167 if (offset + size > pp->mediasize) {
168 gctl_error(req, "Invalid size for provider %s.", pp->name);
172 secsize = pp->sectorsize;
173 else if ((secsize % pp->sectorsize) != 0) {
174 gctl_error(req, "Invalid secsize for provider %s.", pp->name);
177 if (secsize > MAXPHYS) {
178 gctl_error(req, "secsize is too big.");
181 size -= size % secsize;
182 snprintf(name, sizeof(name), "%s%s", pp->name, G_NOP_SUFFIX);
183 LIST_FOREACH(gp, &mp->geom, geom) {
184 if (strcmp(gp->name, name) == 0) {
185 gctl_error(req, "Provider %s already exists.", name);
189 gp = g_new_geomf(mp, name);
190 sc = g_malloc(sizeof(*sc), M_WAITOK);
191 sc->sc_offset = offset;
192 sc->sc_error = ioerror;
193 sc->sc_rfailprob = rfailprob;
194 sc->sc_wfailprob = wfailprob;
197 sc->sc_readbytes = 0;
198 sc->sc_wrotebytes = 0;
200 gp->start = g_nop_start;
201 gp->orphan = g_nop_orphan;
202 gp->access = g_nop_access;
203 gp->dumpconf = g_nop_dumpconf;
205 newpp = g_new_providerf(gp, gp->name);
206 newpp->mediasize = size;
207 newpp->sectorsize = secsize;
209 cp = g_new_consumer(gp);
210 error = g_attach(cp, pp);
212 gctl_error(req, "Cannot attach to provider %s.", pp->name);
216 g_error_provider(newpp, 0);
217 G_NOP_DEBUG(0, "Device %s created.", gp->name);
220 if (cp->provider != NULL)
222 g_destroy_consumer(cp);
223 g_destroy_provider(newpp);
230 g_nop_destroy(struct g_geom *gp, boolean_t force)
232 struct g_provider *pp;
235 if (gp->softc == NULL)
237 pp = LIST_FIRST(&gp->provider);
238 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
240 G_NOP_DEBUG(0, "Device %s is still open, so it "
241 "can't be definitely removed.", pp->name);
243 G_NOP_DEBUG(1, "Device %s is still open (r%dw%de%d).",
244 pp->name, pp->acr, pp->acw, pp->ace);
248 G_NOP_DEBUG(0, "Device %s removed.", gp->name);
252 g_wither_geom(gp, ENXIO);
258 g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
261 return (g_nop_destroy(gp, 0));
265 g_nop_ctl_create(struct gctl_req *req, struct g_class *mp)
267 struct g_provider *pp;
268 intmax_t *error, *rfailprob, *wfailprob, *offset, *secsize, *size;
275 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
277 gctl_error(req, "No '%s' argument", "nargs");
281 gctl_error(req, "Missing device(s).");
284 error = gctl_get_paraml(req, "error", sizeof(*error));
286 gctl_error(req, "No '%s' argument", "error");
289 rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob));
290 if (rfailprob == NULL) {
291 gctl_error(req, "No '%s' argument", "rfailprob");
294 if (*rfailprob < -1 || *rfailprob > 100) {
295 gctl_error(req, "Invalid '%s' argument", "rfailprob");
298 wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob));
299 if (wfailprob == NULL) {
300 gctl_error(req, "No '%s' argument", "wfailprob");
303 if (*wfailprob < -1 || *wfailprob > 100) {
304 gctl_error(req, "Invalid '%s' argument", "wfailprob");
307 offset = gctl_get_paraml(req, "offset", sizeof(*offset));
308 if (offset == NULL) {
309 gctl_error(req, "No '%s' argument", "offset");
313 gctl_error(req, "Invalid '%s' argument", "offset");
316 size = gctl_get_paraml(req, "size", sizeof(*size));
318 gctl_error(req, "No '%s' argument", "size");
322 gctl_error(req, "Invalid '%s' argument", "size");
325 secsize = gctl_get_paraml(req, "secsize", sizeof(*secsize));
326 if (secsize == NULL) {
327 gctl_error(req, "No '%s' argument", "secsize");
331 gctl_error(req, "Invalid '%s' argument", "secsize");
335 for (i = 0; i < *nargs; i++) {
336 snprintf(param, sizeof(param), "arg%d", i);
337 name = gctl_get_asciiparam(req, param);
339 gctl_error(req, "No 'arg%d' argument", i);
342 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
343 name += strlen("/dev/");
344 pp = g_provider_by_name(name);
346 G_NOP_DEBUG(1, "Provider %s is invalid.", name);
347 gctl_error(req, "Provider %s is invalid.", name);
350 if (g_nop_create(req, mp, pp,
351 *error == -1 ? EIO : (int)*error,
352 *rfailprob == -1 ? 0 : (u_int)*rfailprob,
353 *wfailprob == -1 ? 0 : (u_int)*wfailprob,
354 (off_t)*offset, (off_t)*size, (u_int)*secsize) != 0) {
361 g_nop_ctl_configure(struct gctl_req *req, struct g_class *mp)
363 struct g_nop_softc *sc;
364 struct g_provider *pp;
365 intmax_t *error, *rfailprob, *wfailprob;
372 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
374 gctl_error(req, "No '%s' argument", "nargs");
378 gctl_error(req, "Missing device(s).");
381 error = gctl_get_paraml(req, "error", sizeof(*error));
383 gctl_error(req, "No '%s' argument", "error");
386 rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob));
387 if (rfailprob == NULL) {
388 gctl_error(req, "No '%s' argument", "rfailprob");
391 if (*rfailprob < -1 || *rfailprob > 100) {
392 gctl_error(req, "Invalid '%s' argument", "rfailprob");
395 wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob));
396 if (wfailprob == NULL) {
397 gctl_error(req, "No '%s' argument", "wfailprob");
400 if (*wfailprob < -1 || *wfailprob > 100) {
401 gctl_error(req, "Invalid '%s' argument", "wfailprob");
405 for (i = 0; i < *nargs; i++) {
406 snprintf(param, sizeof(param), "arg%d", i);
407 name = gctl_get_asciiparam(req, param);
409 gctl_error(req, "No 'arg%d' argument", i);
412 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
413 name += strlen("/dev/");
414 pp = g_provider_by_name(name);
415 if (pp == NULL || pp->geom->class != mp) {
416 G_NOP_DEBUG(1, "Provider %s is invalid.", name);
417 gctl_error(req, "Provider %s is invalid.", name);
420 sc = pp->geom->softc;
422 sc->sc_error = (int)*error;
423 if (*rfailprob != -1)
424 sc->sc_rfailprob = (u_int)*rfailprob;
425 if (*wfailprob != -1)
426 sc->sc_wfailprob = (u_int)*wfailprob;
430 static struct g_geom *
431 g_nop_find_geom(struct g_class *mp, const char *name)
435 LIST_FOREACH(gp, &mp->geom, geom) {
436 if (strcmp(gp->name, name) == 0)
443 g_nop_ctl_destroy(struct gctl_req *req, struct g_class *mp)
445 int *nargs, *force, error, i;
452 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
454 gctl_error(req, "No '%s' argument", "nargs");
458 gctl_error(req, "Missing device(s).");
461 force = gctl_get_paraml(req, "force", sizeof(*force));
463 gctl_error(req, "No 'force' argument");
467 for (i = 0; i < *nargs; i++) {
468 snprintf(param, sizeof(param), "arg%d", i);
469 name = gctl_get_asciiparam(req, param);
471 gctl_error(req, "No 'arg%d' argument", i);
474 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
475 name += strlen("/dev/");
476 gp = g_nop_find_geom(mp, name);
478 G_NOP_DEBUG(1, "Device %s is invalid.", name);
479 gctl_error(req, "Device %s is invalid.", name);
482 error = g_nop_destroy(gp, *force);
484 gctl_error(req, "Cannot destroy device %s (error=%d).",
492 g_nop_ctl_reset(struct gctl_req *req, struct g_class *mp)
494 struct g_nop_softc *sc;
495 struct g_provider *pp;
502 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
504 gctl_error(req, "No '%s' argument", "nargs");
508 gctl_error(req, "Missing device(s).");
512 for (i = 0; i < *nargs; i++) {
513 snprintf(param, sizeof(param), "arg%d", i);
514 name = gctl_get_asciiparam(req, param);
516 gctl_error(req, "No 'arg%d' argument", i);
519 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
520 name += strlen("/dev/");
521 pp = g_provider_by_name(name);
522 if (pp == NULL || pp->geom->class != mp) {
523 G_NOP_DEBUG(1, "Provider %s is invalid.", name);
524 gctl_error(req, "Provider %s is invalid.", name);
527 sc = pp->geom->softc;
530 sc->sc_readbytes = 0;
531 sc->sc_wrotebytes = 0;
536 g_nop_config(struct gctl_req *req, struct g_class *mp, const char *verb)
542 version = gctl_get_paraml(req, "version", sizeof(*version));
543 if (version == NULL) {
544 gctl_error(req, "No '%s' argument.", "version");
547 if (*version != G_NOP_VERSION) {
548 gctl_error(req, "Userland and kernel parts are out of sync.");
552 if (strcmp(verb, "create") == 0) {
553 g_nop_ctl_create(req, mp);
555 } else if (strcmp(verb, "configure") == 0) {
556 g_nop_ctl_configure(req, mp);
558 } else if (strcmp(verb, "destroy") == 0) {
559 g_nop_ctl_destroy(req, mp);
561 } else if (strcmp(verb, "reset") == 0) {
562 g_nop_ctl_reset(req, mp);
566 gctl_error(req, "Unknown verb.");
570 g_nop_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
571 struct g_consumer *cp, struct g_provider *pp)
573 struct g_nop_softc *sc;
575 if (pp != NULL || cp != NULL)
578 sbuf_printf(sb, "%s<Offset>%jd</Offset>\n", indent,
579 (intmax_t)sc->sc_offset);
580 sbuf_printf(sb, "%s<ReadFailProb>%u</ReadFailProb>\n", indent,
582 sbuf_printf(sb, "%s<WriteFailProb>%u</WriteFailProb>\n", indent,
584 sbuf_printf(sb, "%s<Error>%d</Error>\n", indent, sc->sc_error);
585 sbuf_printf(sb, "%s<Reads>%ju</Reads>\n", indent, sc->sc_reads);
586 sbuf_printf(sb, "%s<Writes>%ju</Writes>\n", indent, sc->sc_writes);
587 sbuf_printf(sb, "%s<ReadBytes>%ju</ReadBytes>\n", indent,
589 sbuf_printf(sb, "%s<WroteBytes>%ju</WroteBytes>\n", indent,
593 DECLARE_GEOM_CLASS(g_nop_class, g_nop);