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>
38 #include <sys/sysctl.h>
39 #include <sys/malloc.h>
40 #include <geom/geom.h>
41 #include <geom/nop/g_nop.h>
44 SYSCTL_DECL(_kern_geom);
45 static SYSCTL_NODE(_kern_geom, OID_AUTO, nop, CTLFLAG_RW, 0, "GEOM_NOP stuff");
46 static u_int g_nop_debug = 0;
47 SYSCTL_UINT(_kern_geom_nop, OID_AUTO, debug, CTLFLAG_RW, &g_nop_debug, 0,
50 static int g_nop_destroy(struct g_geom *gp, boolean_t force);
51 static int g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp,
53 static void g_nop_config(struct gctl_req *req, struct g_class *mp,
55 static void g_nop_dumpconf(struct sbuf *sb, const char *indent,
56 struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp);
58 struct g_class g_nop_class = {
59 .name = G_NOP_CLASS_NAME,
61 .ctlreq = g_nop_config,
62 .destroy_geom = g_nop_destroy_geom
67 g_nop_orphan(struct g_consumer *cp)
71 g_nop_destroy(cp->geom, 1);
75 g_nop_start(struct bio *bp)
77 struct g_nop_softc *sc;
79 struct g_provider *pp;
83 gp = bp->bio_to->geom;
85 G_NOP_LOGREQ(bp, "Request received.");
86 switch (bp->bio_cmd) {
89 sc->sc_readbytes += bp->bio_length;
90 failprob = sc->sc_rfailprob;
94 sc->sc_wrotebytes += bp->bio_length;
95 failprob = sc->sc_wfailprob;
101 rval = arc4random() % 100;
102 if (rval < failprob) {
103 G_NOP_LOGREQ(bp, "Returning error=%d.", sc->sc_error);
104 g_io_deliver(bp, sc->sc_error);
108 cbp = g_clone_bio(bp);
110 g_io_deliver(bp, ENOMEM);
113 cbp->bio_done = g_std_done;
114 cbp->bio_offset = bp->bio_offset + sc->sc_offset;
115 pp = LIST_FIRST(&gp->provider);
116 KASSERT(pp != NULL, ("NULL pp"));
118 G_NOP_LOGREQ(cbp, "Sending request.");
119 g_io_request(cbp, LIST_FIRST(&gp->consumer));
123 g_nop_access(struct g_provider *pp, int dr, int dw, int de)
126 struct g_consumer *cp;
130 cp = LIST_FIRST(&gp->consumer);
131 error = g_access(cp, dr, dw, de);
137 g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp,
138 int ioerror, u_int rfailprob, u_int wfailprob, off_t offset, off_t size,
141 struct g_nop_softc *sc;
143 struct g_provider *newpp;
144 struct g_consumer *cp;
154 if ((offset % pp->sectorsize) != 0) {
155 gctl_error(req, "Invalid offset for provider %s.", pp->name);
158 if ((size % pp->sectorsize) != 0) {
159 gctl_error(req, "Invalid size for provider %s.", pp->name);
162 if (offset >= pp->mediasize) {
163 gctl_error(req, "Invalid offset for provider %s.", pp->name);
167 size = pp->mediasize - offset;
168 if (offset + size > pp->mediasize) {
169 gctl_error(req, "Invalid size for provider %s.", pp->name);
173 secsize = pp->sectorsize;
174 else if ((secsize % pp->sectorsize) != 0) {
175 gctl_error(req, "Invalid secsize for provider %s.", pp->name);
178 if (secsize > MAXPHYS) {
179 gctl_error(req, "secsize is too big.");
182 size -= size % secsize;
183 snprintf(name, sizeof(name), "%s%s", pp->name, G_NOP_SUFFIX);
184 LIST_FOREACH(gp, &mp->geom, geom) {
185 if (strcmp(gp->name, name) == 0) {
186 gctl_error(req, "Provider %s already exists.", name);
190 gp = g_new_geomf(mp, "%s", name);
191 sc = g_malloc(sizeof(*sc), M_WAITOK);
192 sc->sc_offset = offset;
193 sc->sc_error = ioerror;
194 sc->sc_rfailprob = rfailprob;
195 sc->sc_wfailprob = wfailprob;
198 sc->sc_readbytes = 0;
199 sc->sc_wrotebytes = 0;
201 gp->start = g_nop_start;
202 gp->orphan = g_nop_orphan;
203 gp->access = g_nop_access;
204 gp->dumpconf = g_nop_dumpconf;
206 newpp = g_new_providerf(gp, "%s", gp->name);
207 newpp->mediasize = size;
208 newpp->sectorsize = secsize;
210 cp = g_new_consumer(gp);
211 error = g_attach(cp, pp);
213 gctl_error(req, "Cannot attach to provider %s.", pp->name);
217 newpp->flags |= pp->flags & G_PF_ACCEPT_UNMAPPED;
218 g_error_provider(newpp, 0);
219 G_NOP_DEBUG(0, "Device %s created.", gp->name);
222 if (cp->provider != NULL)
224 g_destroy_consumer(cp);
225 g_destroy_provider(newpp);
232 g_nop_destroy(struct g_geom *gp, boolean_t force)
234 struct g_provider *pp;
237 if (gp->softc == NULL)
239 pp = LIST_FIRST(&gp->provider);
240 if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) {
242 G_NOP_DEBUG(0, "Device %s is still open, so it "
243 "can't be definitely removed.", pp->name);
245 G_NOP_DEBUG(1, "Device %s is still open (r%dw%de%d).",
246 pp->name, pp->acr, pp->acw, pp->ace);
250 G_NOP_DEBUG(0, "Device %s removed.", gp->name);
254 g_wither_geom(gp, ENXIO);
260 g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp)
263 return (g_nop_destroy(gp, 0));
267 g_nop_ctl_create(struct gctl_req *req, struct g_class *mp)
269 struct g_provider *pp;
270 intmax_t *error, *rfailprob, *wfailprob, *offset, *secsize, *size;
277 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
279 gctl_error(req, "No '%s' argument", "nargs");
283 gctl_error(req, "Missing device(s).");
286 error = gctl_get_paraml(req, "error", sizeof(*error));
288 gctl_error(req, "No '%s' argument", "error");
291 rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob));
292 if (rfailprob == NULL) {
293 gctl_error(req, "No '%s' argument", "rfailprob");
296 if (*rfailprob < -1 || *rfailprob > 100) {
297 gctl_error(req, "Invalid '%s' argument", "rfailprob");
300 wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob));
301 if (wfailprob == NULL) {
302 gctl_error(req, "No '%s' argument", "wfailprob");
305 if (*wfailprob < -1 || *wfailprob > 100) {
306 gctl_error(req, "Invalid '%s' argument", "wfailprob");
309 offset = gctl_get_paraml(req, "offset", sizeof(*offset));
310 if (offset == NULL) {
311 gctl_error(req, "No '%s' argument", "offset");
315 gctl_error(req, "Invalid '%s' argument", "offset");
318 size = gctl_get_paraml(req, "size", sizeof(*size));
320 gctl_error(req, "No '%s' argument", "size");
324 gctl_error(req, "Invalid '%s' argument", "size");
327 secsize = gctl_get_paraml(req, "secsize", sizeof(*secsize));
328 if (secsize == NULL) {
329 gctl_error(req, "No '%s' argument", "secsize");
333 gctl_error(req, "Invalid '%s' argument", "secsize");
337 for (i = 0; i < *nargs; i++) {
338 snprintf(param, sizeof(param), "arg%d", i);
339 name = gctl_get_asciiparam(req, param);
341 gctl_error(req, "No 'arg%d' argument", i);
344 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
345 name += strlen("/dev/");
346 pp = g_provider_by_name(name);
348 G_NOP_DEBUG(1, "Provider %s is invalid.", name);
349 gctl_error(req, "Provider %s is invalid.", name);
352 if (g_nop_create(req, mp, pp,
353 *error == -1 ? EIO : (int)*error,
354 *rfailprob == -1 ? 0 : (u_int)*rfailprob,
355 *wfailprob == -1 ? 0 : (u_int)*wfailprob,
356 (off_t)*offset, (off_t)*size, (u_int)*secsize) != 0) {
363 g_nop_ctl_configure(struct gctl_req *req, struct g_class *mp)
365 struct g_nop_softc *sc;
366 struct g_provider *pp;
367 intmax_t *error, *rfailprob, *wfailprob;
374 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
376 gctl_error(req, "No '%s' argument", "nargs");
380 gctl_error(req, "Missing device(s).");
383 error = gctl_get_paraml(req, "error", sizeof(*error));
385 gctl_error(req, "No '%s' argument", "error");
388 rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob));
389 if (rfailprob == NULL) {
390 gctl_error(req, "No '%s' argument", "rfailprob");
393 if (*rfailprob < -1 || *rfailprob > 100) {
394 gctl_error(req, "Invalid '%s' argument", "rfailprob");
397 wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob));
398 if (wfailprob == NULL) {
399 gctl_error(req, "No '%s' argument", "wfailprob");
402 if (*wfailprob < -1 || *wfailprob > 100) {
403 gctl_error(req, "Invalid '%s' argument", "wfailprob");
407 for (i = 0; i < *nargs; i++) {
408 snprintf(param, sizeof(param), "arg%d", i);
409 name = gctl_get_asciiparam(req, param);
411 gctl_error(req, "No 'arg%d' argument", i);
414 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
415 name += strlen("/dev/");
416 pp = g_provider_by_name(name);
417 if (pp == NULL || pp->geom->class != mp) {
418 G_NOP_DEBUG(1, "Provider %s is invalid.", name);
419 gctl_error(req, "Provider %s is invalid.", name);
422 sc = pp->geom->softc;
424 sc->sc_error = (int)*error;
425 if (*rfailprob != -1)
426 sc->sc_rfailprob = (u_int)*rfailprob;
427 if (*wfailprob != -1)
428 sc->sc_wfailprob = (u_int)*wfailprob;
432 static struct g_geom *
433 g_nop_find_geom(struct g_class *mp, const char *name)
437 LIST_FOREACH(gp, &mp->geom, geom) {
438 if (strcmp(gp->name, name) == 0)
445 g_nop_ctl_destroy(struct gctl_req *req, struct g_class *mp)
447 int *nargs, *force, error, i;
454 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
456 gctl_error(req, "No '%s' argument", "nargs");
460 gctl_error(req, "Missing device(s).");
463 force = gctl_get_paraml(req, "force", sizeof(*force));
465 gctl_error(req, "No 'force' argument");
469 for (i = 0; i < *nargs; i++) {
470 snprintf(param, sizeof(param), "arg%d", i);
471 name = gctl_get_asciiparam(req, param);
473 gctl_error(req, "No 'arg%d' argument", i);
476 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
477 name += strlen("/dev/");
478 gp = g_nop_find_geom(mp, name);
480 G_NOP_DEBUG(1, "Device %s is invalid.", name);
481 gctl_error(req, "Device %s is invalid.", name);
484 error = g_nop_destroy(gp, *force);
486 gctl_error(req, "Cannot destroy device %s (error=%d).",
494 g_nop_ctl_reset(struct gctl_req *req, struct g_class *mp)
496 struct g_nop_softc *sc;
497 struct g_provider *pp;
504 nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs));
506 gctl_error(req, "No '%s' argument", "nargs");
510 gctl_error(req, "Missing device(s).");
514 for (i = 0; i < *nargs; i++) {
515 snprintf(param, sizeof(param), "arg%d", i);
516 name = gctl_get_asciiparam(req, param);
518 gctl_error(req, "No 'arg%d' argument", i);
521 if (strncmp(name, "/dev/", strlen("/dev/")) == 0)
522 name += strlen("/dev/");
523 pp = g_provider_by_name(name);
524 if (pp == NULL || pp->geom->class != mp) {
525 G_NOP_DEBUG(1, "Provider %s is invalid.", name);
526 gctl_error(req, "Provider %s is invalid.", name);
529 sc = pp->geom->softc;
532 sc->sc_readbytes = 0;
533 sc->sc_wrotebytes = 0;
538 g_nop_config(struct gctl_req *req, struct g_class *mp, const char *verb)
544 version = gctl_get_paraml(req, "version", sizeof(*version));
545 if (version == NULL) {
546 gctl_error(req, "No '%s' argument.", "version");
549 if (*version != G_NOP_VERSION) {
550 gctl_error(req, "Userland and kernel parts are out of sync.");
554 if (strcmp(verb, "create") == 0) {
555 g_nop_ctl_create(req, mp);
557 } else if (strcmp(verb, "configure") == 0) {
558 g_nop_ctl_configure(req, mp);
560 } else if (strcmp(verb, "destroy") == 0) {
561 g_nop_ctl_destroy(req, mp);
563 } else if (strcmp(verb, "reset") == 0) {
564 g_nop_ctl_reset(req, mp);
568 gctl_error(req, "Unknown verb.");
572 g_nop_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp,
573 struct g_consumer *cp, struct g_provider *pp)
575 struct g_nop_softc *sc;
577 if (pp != NULL || cp != NULL)
580 sbuf_printf(sb, "%s<Offset>%jd</Offset>\n", indent,
581 (intmax_t)sc->sc_offset);
582 sbuf_printf(sb, "%s<ReadFailProb>%u</ReadFailProb>\n", indent,
584 sbuf_printf(sb, "%s<WriteFailProb>%u</WriteFailProb>\n", indent,
586 sbuf_printf(sb, "%s<Error>%d</Error>\n", indent, sc->sc_error);
587 sbuf_printf(sb, "%s<Reads>%ju</Reads>\n", indent, sc->sc_reads);
588 sbuf_printf(sb, "%s<Writes>%ju</Writes>\n", indent, sc->sc_writes);
589 sbuf_printf(sb, "%s<ReadBytes>%ju</ReadBytes>\n", indent,
591 sbuf_printf(sb, "%s<WroteBytes>%ju</WroteBytes>\n", indent,
595 DECLARE_GEOM_CLASS(g_nop_class, g_nop);