Current Path : /sys/geom/nop/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/geom/nop/g_nop.c |
/*- * Copyright (c) 2004-2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD: release/9.1.0/sys/geom/nop/g_nop.c 223921 2011-07-11 05:22:31Z ae $"); #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> #include <sys/module.h> #include <sys/lock.h> #include <sys/mutex.h> #include <sys/bio.h> #include <sys/sbuf.h> #include <sys/sysctl.h> #include <sys/malloc.h> #include <geom/geom.h> #include <geom/nop/g_nop.h> SYSCTL_DECL(_kern_geom); SYSCTL_NODE(_kern_geom, OID_AUTO, nop, CTLFLAG_RW, 0, "GEOM_NOP stuff"); static u_int g_nop_debug = 0; SYSCTL_UINT(_kern_geom_nop, OID_AUTO, debug, CTLFLAG_RW, &g_nop_debug, 0, "Debug level"); static int g_nop_destroy(struct g_geom *gp, boolean_t force); static int g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp); static void g_nop_config(struct gctl_req *req, struct g_class *mp, const char *verb); static void g_nop_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp); struct g_class g_nop_class = { .name = G_NOP_CLASS_NAME, .version = G_VERSION, .ctlreq = g_nop_config, .destroy_geom = g_nop_destroy_geom }; static void g_nop_orphan(struct g_consumer *cp) { g_topology_assert(); g_nop_destroy(cp->geom, 1); } static void g_nop_start(struct bio *bp) { struct g_nop_softc *sc; struct g_geom *gp; struct g_provider *pp; struct bio *cbp; u_int failprob = 0; gp = bp->bio_to->geom; sc = gp->softc; G_NOP_LOGREQ(bp, "Request received."); switch (bp->bio_cmd) { case BIO_READ: sc->sc_reads++; sc->sc_readbytes += bp->bio_length; failprob = sc->sc_rfailprob; break; case BIO_WRITE: sc->sc_writes++; sc->sc_wrotebytes += bp->bio_length; failprob = sc->sc_wfailprob; break; } if (failprob > 0) { u_int rval; rval = arc4random() % 100; if (rval < failprob) { G_NOP_LOGREQ(bp, "Returning error=%d.", sc->sc_error); g_io_deliver(bp, sc->sc_error); return; } } cbp = g_clone_bio(bp); if (cbp == NULL) { g_io_deliver(bp, ENOMEM); return; } cbp->bio_done = g_std_done; cbp->bio_offset = bp->bio_offset + sc->sc_offset; cbp->bio_data = bp->bio_data; cbp->bio_length = bp->bio_length; pp = LIST_FIRST(&gp->provider); KASSERT(pp != NULL, ("NULL pp")); cbp->bio_to = pp; G_NOP_LOGREQ(cbp, "Sending request."); g_io_request(cbp, LIST_FIRST(&gp->consumer)); } static int g_nop_access(struct g_provider *pp, int dr, int dw, int de) { struct g_geom *gp; struct g_consumer *cp; int error; gp = pp->geom; cp = LIST_FIRST(&gp->consumer); error = g_access(cp, dr, dw, de); return (error); } static int g_nop_create(struct gctl_req *req, struct g_class *mp, struct g_provider *pp, int ioerror, u_int rfailprob, u_int wfailprob, off_t offset, off_t size, u_int secsize) { struct g_nop_softc *sc; struct g_geom *gp; struct g_provider *newpp; struct g_consumer *cp; char name[64]; int error; g_topology_assert(); gp = NULL; newpp = NULL; cp = NULL; if ((offset % pp->sectorsize) != 0) { gctl_error(req, "Invalid offset for provider %s.", pp->name); return (EINVAL); } if ((size % pp->sectorsize) != 0) { gctl_error(req, "Invalid size for provider %s.", pp->name); return (EINVAL); } if (offset >= pp->mediasize) { gctl_error(req, "Invalid offset for provider %s.", pp->name); return (EINVAL); } if (size == 0) size = pp->mediasize - offset; if (offset + size > pp->mediasize) { gctl_error(req, "Invalid size for provider %s.", pp->name); return (EINVAL); } if (secsize == 0) secsize = pp->sectorsize; else if ((secsize % pp->sectorsize) != 0) { gctl_error(req, "Invalid secsize for provider %s.", pp->name); return (EINVAL); } if (secsize > MAXPHYS) { gctl_error(req, "secsize is too big."); return (EINVAL); } size -= size % secsize; snprintf(name, sizeof(name), "%s%s", pp->name, G_NOP_SUFFIX); LIST_FOREACH(gp, &mp->geom, geom) { if (strcmp(gp->name, name) == 0) { gctl_error(req, "Provider %s already exists.", name); return (EEXIST); } } gp = g_new_geomf(mp, name); sc = g_malloc(sizeof(*sc), M_WAITOK); sc->sc_offset = offset; sc->sc_error = ioerror; sc->sc_rfailprob = rfailprob; sc->sc_wfailprob = wfailprob; sc->sc_reads = 0; sc->sc_writes = 0; sc->sc_readbytes = 0; sc->sc_wrotebytes = 0; gp->softc = sc; gp->start = g_nop_start; gp->orphan = g_nop_orphan; gp->access = g_nop_access; gp->dumpconf = g_nop_dumpconf; newpp = g_new_providerf(gp, gp->name); newpp->mediasize = size; newpp->sectorsize = secsize; cp = g_new_consumer(gp); error = g_attach(cp, pp); if (error != 0) { gctl_error(req, "Cannot attach to provider %s.", pp->name); goto fail; } g_error_provider(newpp, 0); G_NOP_DEBUG(0, "Device %s created.", gp->name); return (0); fail: if (cp->provider != NULL) g_detach(cp); g_destroy_consumer(cp); g_destroy_provider(newpp); g_free(gp->softc); g_destroy_geom(gp); return (error); } static int g_nop_destroy(struct g_geom *gp, boolean_t force) { struct g_provider *pp; g_topology_assert(); if (gp->softc == NULL) return (ENXIO); pp = LIST_FIRST(&gp->provider); if (pp != NULL && (pp->acr != 0 || pp->acw != 0 || pp->ace != 0)) { if (force) { G_NOP_DEBUG(0, "Device %s is still open, so it " "can't be definitely removed.", pp->name); } else { G_NOP_DEBUG(1, "Device %s is still open (r%dw%de%d).", pp->name, pp->acr, pp->acw, pp->ace); return (EBUSY); } } else { G_NOP_DEBUG(0, "Device %s removed.", gp->name); } g_free(gp->softc); gp->softc = NULL; g_wither_geom(gp, ENXIO); return (0); } static int g_nop_destroy_geom(struct gctl_req *req, struct g_class *mp, struct g_geom *gp) { return (g_nop_destroy(gp, 0)); } static void g_nop_ctl_create(struct gctl_req *req, struct g_class *mp) { struct g_provider *pp; intmax_t *error, *rfailprob, *wfailprob, *offset, *secsize, *size; const char *name; char param[16]; int i, *nargs; g_topology_assert(); nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); if (nargs == NULL) { gctl_error(req, "No '%s' argument", "nargs"); return; } if (*nargs <= 0) { gctl_error(req, "Missing device(s)."); return; } error = gctl_get_paraml(req, "error", sizeof(*error)); if (error == NULL) { gctl_error(req, "No '%s' argument", "error"); return; } rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob)); if (rfailprob == NULL) { gctl_error(req, "No '%s' argument", "rfailprob"); return; } if (*rfailprob < -1 || *rfailprob > 100) { gctl_error(req, "Invalid '%s' argument", "rfailprob"); return; } wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob)); if (wfailprob == NULL) { gctl_error(req, "No '%s' argument", "wfailprob"); return; } if (*wfailprob < -1 || *wfailprob > 100) { gctl_error(req, "Invalid '%s' argument", "wfailprob"); return; } offset = gctl_get_paraml(req, "offset", sizeof(*offset)); if (offset == NULL) { gctl_error(req, "No '%s' argument", "offset"); return; } if (*offset < 0) { gctl_error(req, "Invalid '%s' argument", "offset"); return; } size = gctl_get_paraml(req, "size", sizeof(*size)); if (size == NULL) { gctl_error(req, "No '%s' argument", "size"); return; } if (*size < 0) { gctl_error(req, "Invalid '%s' argument", "size"); return; } secsize = gctl_get_paraml(req, "secsize", sizeof(*secsize)); if (secsize == NULL) { gctl_error(req, "No '%s' argument", "secsize"); return; } if (*secsize < 0) { gctl_error(req, "Invalid '%s' argument", "secsize"); return; } for (i = 0; i < *nargs; i++) { snprintf(param, sizeof(param), "arg%d", i); name = gctl_get_asciiparam(req, param); if (name == NULL) { gctl_error(req, "No 'arg%d' argument", i); return; } if (strncmp(name, "/dev/", strlen("/dev/")) == 0) name += strlen("/dev/"); pp = g_provider_by_name(name); if (pp == NULL) { G_NOP_DEBUG(1, "Provider %s is invalid.", name); gctl_error(req, "Provider %s is invalid.", name); return; } if (g_nop_create(req, mp, pp, *error == -1 ? EIO : (int)*error, *rfailprob == -1 ? 0 : (u_int)*rfailprob, *wfailprob == -1 ? 0 : (u_int)*wfailprob, (off_t)*offset, (off_t)*size, (u_int)*secsize) != 0) { return; } } } static void g_nop_ctl_configure(struct gctl_req *req, struct g_class *mp) { struct g_nop_softc *sc; struct g_provider *pp; intmax_t *error, *rfailprob, *wfailprob; const char *name; char param[16]; int i, *nargs; g_topology_assert(); nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); if (nargs == NULL) { gctl_error(req, "No '%s' argument", "nargs"); return; } if (*nargs <= 0) { gctl_error(req, "Missing device(s)."); return; } error = gctl_get_paraml(req, "error", sizeof(*error)); if (error == NULL) { gctl_error(req, "No '%s' argument", "error"); return; } rfailprob = gctl_get_paraml(req, "rfailprob", sizeof(*rfailprob)); if (rfailprob == NULL) { gctl_error(req, "No '%s' argument", "rfailprob"); return; } if (*rfailprob < -1 || *rfailprob > 100) { gctl_error(req, "Invalid '%s' argument", "rfailprob"); return; } wfailprob = gctl_get_paraml(req, "wfailprob", sizeof(*wfailprob)); if (wfailprob == NULL) { gctl_error(req, "No '%s' argument", "wfailprob"); return; } if (*wfailprob < -1 || *wfailprob > 100) { gctl_error(req, "Invalid '%s' argument", "wfailprob"); return; } for (i = 0; i < *nargs; i++) { snprintf(param, sizeof(param), "arg%d", i); name = gctl_get_asciiparam(req, param); if (name == NULL) { gctl_error(req, "No 'arg%d' argument", i); return; } if (strncmp(name, "/dev/", strlen("/dev/")) == 0) name += strlen("/dev/"); pp = g_provider_by_name(name); if (pp == NULL || pp->geom->class != mp) { G_NOP_DEBUG(1, "Provider %s is invalid.", name); gctl_error(req, "Provider %s is invalid.", name); return; } sc = pp->geom->softc; if (*error != -1) sc->sc_error = (int)*error; if (*rfailprob != -1) sc->sc_rfailprob = (u_int)*rfailprob; if (*wfailprob != -1) sc->sc_wfailprob = (u_int)*wfailprob; } } static struct g_geom * g_nop_find_geom(struct g_class *mp, const char *name) { struct g_geom *gp; LIST_FOREACH(gp, &mp->geom, geom) { if (strcmp(gp->name, name) == 0) return (gp); } return (NULL); } static void g_nop_ctl_destroy(struct gctl_req *req, struct g_class *mp) { int *nargs, *force, error, i; struct g_geom *gp; const char *name; char param[16]; g_topology_assert(); nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); if (nargs == NULL) { gctl_error(req, "No '%s' argument", "nargs"); return; } if (*nargs <= 0) { gctl_error(req, "Missing device(s)."); return; } force = gctl_get_paraml(req, "force", sizeof(*force)); if (force == NULL) { gctl_error(req, "No 'force' argument"); return; } for (i = 0; i < *nargs; i++) { snprintf(param, sizeof(param), "arg%d", i); name = gctl_get_asciiparam(req, param); if (name == NULL) { gctl_error(req, "No 'arg%d' argument", i); return; } if (strncmp(name, "/dev/", strlen("/dev/")) == 0) name += strlen("/dev/"); gp = g_nop_find_geom(mp, name); if (gp == NULL) { G_NOP_DEBUG(1, "Device %s is invalid.", name); gctl_error(req, "Device %s is invalid.", name); return; } error = g_nop_destroy(gp, *force); if (error != 0) { gctl_error(req, "Cannot destroy device %s (error=%d).", gp->name, error); return; } } } static void g_nop_ctl_reset(struct gctl_req *req, struct g_class *mp) { struct g_nop_softc *sc; struct g_provider *pp; const char *name; char param[16]; int i, *nargs; g_topology_assert(); nargs = gctl_get_paraml(req, "nargs", sizeof(*nargs)); if (nargs == NULL) { gctl_error(req, "No '%s' argument", "nargs"); return; } if (*nargs <= 0) { gctl_error(req, "Missing device(s)."); return; } for (i = 0; i < *nargs; i++) { snprintf(param, sizeof(param), "arg%d", i); name = gctl_get_asciiparam(req, param); if (name == NULL) { gctl_error(req, "No 'arg%d' argument", i); return; } if (strncmp(name, "/dev/", strlen("/dev/")) == 0) name += strlen("/dev/"); pp = g_provider_by_name(name); if (pp == NULL || pp->geom->class != mp) { G_NOP_DEBUG(1, "Provider %s is invalid.", name); gctl_error(req, "Provider %s is invalid.", name); return; } sc = pp->geom->softc; sc->sc_reads = 0; sc->sc_writes = 0; sc->sc_readbytes = 0; sc->sc_wrotebytes = 0; } } static void g_nop_config(struct gctl_req *req, struct g_class *mp, const char *verb) { uint32_t *version; g_topology_assert(); version = gctl_get_paraml(req, "version", sizeof(*version)); if (version == NULL) { gctl_error(req, "No '%s' argument.", "version"); return; } if (*version != G_NOP_VERSION) { gctl_error(req, "Userland and kernel parts are out of sync."); return; } if (strcmp(verb, "create") == 0) { g_nop_ctl_create(req, mp); return; } else if (strcmp(verb, "configure") == 0) { g_nop_ctl_configure(req, mp); return; } else if (strcmp(verb, "destroy") == 0) { g_nop_ctl_destroy(req, mp); return; } else if (strcmp(verb, "reset") == 0) { g_nop_ctl_reset(req, mp); return; } gctl_error(req, "Unknown verb."); } static void g_nop_dumpconf(struct sbuf *sb, const char *indent, struct g_geom *gp, struct g_consumer *cp, struct g_provider *pp) { struct g_nop_softc *sc; if (pp != NULL || cp != NULL) return; sc = gp->softc; sbuf_printf(sb, "%s<Offset>%jd</Offset>\n", indent, (intmax_t)sc->sc_offset); sbuf_printf(sb, "%s<ReadFailProb>%u</ReadFailProb>\n", indent, sc->sc_rfailprob); sbuf_printf(sb, "%s<WriteFailProb>%u</WriteFailProb>\n", indent, sc->sc_wfailprob); sbuf_printf(sb, "%s<Error>%d</Error>\n", indent, sc->sc_error); sbuf_printf(sb, "%s<Reads>%ju</Reads>\n", indent, sc->sc_reads); sbuf_printf(sb, "%s<Writes>%ju</Writes>\n", indent, sc->sc_writes); sbuf_printf(sb, "%s<ReadBytes>%ju</ReadBytes>\n", indent, sc->sc_readbytes); sbuf_printf(sb, "%s<WroteBytes>%ju</WroteBytes>\n", indent, sc->sc_wrotebytes); } DECLARE_GEOM_CLASS(g_nop_class, g_nop);