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Merged from geom_mbr.c revisions 1.62 and 1.66.

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- Implement a gctl handler and the verb "write MBR".
This commit is contained in:
Yoshihiro Takahashi 2005-07-15 15:29:45 +00:00
parent e46be7ffad
commit 0bf2708b8c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=148061
1 changed files with 68 additions and 6 deletions
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74
sys/geom/geom_pc98.c
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@ -71,8 +71,12 @@ g_pc98_print(int i, struct pc98_partition *dp)
printf(" sname:%s\n", sname);
}
/*
* XXX: Add gctl_req arg and give good error msgs.
* XXX: Check that length argument does not bring boot code inside any slice.
*/
static int
g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec)
g_pc98_modify(struct g_geom *gp, struct g_pc98_softc *ms, u_char *sec, int len __unused)
{
int i, error;
off_t s[NDOSPART], l[NDOSPART];
@ -155,22 +159,32 @@ g_pc98_ioctl(struct g_provider *pp, u_long cmd, void *data, int fflag, struct th
struct g_pc98_softc *ms;
struct g_slicer *gsp;
struct g_consumer *cp;
int error;
int error, opened;
gp = pp->geom;
gsp = gp->softc;
ms = gsp->softc;
opened = 0;
error = 0;
switch(cmd) {
case DIOCSPC98: {
if (!(fflag & FWRITE))
return (EPERM);
DROP_GIANT();
g_topology_lock();
/* Validate and modify our slicer instance to match. */
error = g_pc98_modify(gp, ms, data);
cp = LIST_FIRST(&gp->consumer);
error = g_write_data(cp, 0, data, 8192);
if (cp->acw == 0) {
error = g_access(cp, 0, 1, 0);
if (error == 0)
opened = 1;
}
if (!error)
error = g_pc98_modify(gp, ms, data, 8192);
if (!error)
error = g_write_data(cp, 0, data, 8192);
if (opened)
g_access(cp, 0, -1 , 0);
g_topology_unlock();
PICKUP_GIANT();
return(error);
@ -281,7 +295,7 @@ g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
ms->fwheads = fwheads;
ms->sectorsize = sectorsize;
g_topology_lock();
g_pc98_modify(gp, ms, buf);
g_pc98_modify(gp, ms, buf, 8192);
g_topology_unlock();
g_free(buf);
break;
@ -295,11 +309,59 @@ g_pc98_taste(struct g_class *mp, struct g_provider *pp, int flags)
return (gp);
}
static void
g_pc98_config(struct gctl_req *req, struct g_class *mp, const char *verb)
{
struct g_geom *gp;
struct g_consumer *cp;
struct g_pc98_softc *ms;
struct g_slicer *gsp;
int opened = 0, error = 0;
void *data;
int len;
g_topology_assert();
gp = gctl_get_geom(req, mp, "geom");
if (gp == NULL)
return;
if (strcmp(verb, "write PC98")) {
gctl_error(req, "Unknown verb");
return;
}
gsp = gp->softc;
ms = gsp->softc;
data = gctl_get_param(req, "data", &len);
if (data == NULL)
return;
if (len < 8192 || (len % 512)) {
gctl_error(req, "Wrong request length");
return;
}
cp = LIST_FIRST(&gp->consumer);
if (cp->acw == 0) {
error = g_access(cp, 0, 1, 0);
if (error == 0)
opened = 1;
}
if (!error)
error = g_pc98_modify(gp, ms, data, len);
if (error)
gctl_error(req, "conflict with open slices");
if (!error)
error = g_write_data(cp, 0, data, len);
if (error)
gctl_error(req, "sector zero write failed");
if (opened)
g_access(cp, 0, -1 , 0);
return;
}
static struct g_class g_pc98_class = {
.name = PC98_CLASS_NAME,
.version = G_VERSION,
.taste = g_pc98_taste,
.dumpconf = g_pc98_dumpconf,
.ctlreq = g_pc98_config,
.ioctl = g_pc98_ioctl,
};