Implement a gctl handler and the verb "write MBR" which can be used to
update metadata and bootcode while the MBR is in use. MFC candidate
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parent
a976a7a3c0
commit
1c3cf26412
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=148034
@ -86,8 +86,12 @@ struct g_mbr_softc {
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u_char slicesum[16];
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};
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/*
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* XXX: Add gctl_req arg and give good error msgs.
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* XXX: Check that length argument does not bring boot code inside any slice.
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*/
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static int
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g_mbr_modify(struct g_geom *gp, struct g_mbr_softc *ms, u_char *sec0)
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g_mbr_modify(struct g_geom *gp, struct g_mbr_softc *ms, u_char *sec0, int len __unused)
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{
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int i, error;
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off_t l[NDOSPART];
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@ -104,8 +108,6 @@ g_mbr_modify(struct g_geom *gp, struct g_mbr_softc *ms, u_char *sec0)
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dos_partition_dec(
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sec0 + DOSPARTOFF + i * sizeof(struct dos_partition),
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dp + i);
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if (0 && bootverbose)
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g_mbr_print(i, dp + i);
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}
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if ((!bcmp(dp, historical_bogus_partition_table,
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sizeof historical_bogus_partition_table)) ||
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@ -193,7 +195,7 @@ g_mbr_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct thr
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opened = 1;
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}
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if (!error)
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error = g_mbr_modify(gp, ms, data);
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error = g_mbr_modify(gp, ms, data, 512);
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if (!error)
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error = g_write_data(cp, 0, data, 512);
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if (opened)
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@ -301,7 +303,7 @@ g_mbr_taste(struct g_class *mp, struct g_provider *pp, int insist)
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}
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g_topology_lock();
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g_mbr_modify(gp, ms, buf);
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g_mbr_modify(gp, ms, buf, 512);
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g_topology_unlock();
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g_free(buf);
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break;
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@ -315,11 +317,59 @@ g_mbr_taste(struct g_class *mp, struct g_provider *pp, int insist)
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return (gp);
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}
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static void
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g_mbr_config(struct gctl_req *req, struct g_class *mp, const char *verb)
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{
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struct g_geom *gp;
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struct g_consumer *cp;
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struct g_mbr_softc *ms;
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struct g_slicer *gsp;
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int opened = 0, error = 0;
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void *data;
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int len;
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g_topology_assert();
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gp = gctl_get_geom(req, mp, "geom");
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if (gp == NULL)
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return;
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if (strcmp(verb, "write MBR")) {
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gctl_error(req, "Unknown verb");
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return;
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}
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gsp = gp->softc;
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ms = gsp->softc;
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data = gctl_get_param(req, "data", &len);
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if (data == NULL)
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return;
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if (len < 512 || (len % 512)) {
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gctl_error(req, "Wrong request length");
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return;
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}
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cp = LIST_FIRST(&gp->consumer);
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if (cp->acw == 0) {
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error = g_access(cp, 0, 1, 0);
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if (error == 0)
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opened = 1;
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}
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if (!error)
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error = g_mbr_modify(gp, ms, data, len);
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if (error)
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gctl_error(req, "conflict with open slices");
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if (!error)
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error = g_write_data(cp, 0, data, len);
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if (error)
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gctl_error(req, "sector zero write failed");
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if (opened)
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g_access(cp, 0, -1 , 0);
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return;
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}
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static struct g_class g_mbr_class = {
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.name = MBR_CLASS_NAME,
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.version = G_VERSION,
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.taste = g_mbr_taste,
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.dumpconf = g_mbr_dumpconf,
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.ctlreq = g_mbr_config,
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.ioctl = g_mbr_ioctl,
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};
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