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Move configuration of geom/providers into its own function in preparation

Browse source 
for adding on-the-fly config interface.
This commit is contained in:
Poul-Henning Kamp 2003-02-01 08:28:43 +00:00
parent 308d2886f5
commit 5f6fb2dde3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=110183
1 changed files with 64 additions and 35 deletions
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99
sys/geom/geom_sunlabel.c
View file

@ -42,6 +42,7 @@
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/errno.h>
#include <err.h>
#else
#include <sys/systm.h>
@ -59,11 +60,62 @@
#define SUNLABEL_CLASS_NAME "SUN"
struct g_sunlabel_softc {
int sectorsize;
int nheads;
int nsects;
int nalt;
};
static int
g_sunlabel_modify(struct g_geom *gp, struct g_sunlabel_softc *ms, u_char *sec0)
{
int i, error;
u_int u, v, csize;
/* The second last short is a magic number */
if (g_dec_be2(sec0 + 508) != 0xdabe)
return (EBUSY);
/* The shortword parity of the entire thing must be even */
u = 0;
for (i = 0; i < 512; i += 2)
u ^= g_dec_be2(sec0 + i);
if (u != 0)
return(EBUSY);
csize = g_dec_be2(sec0 + 436) * g_dec_be2(sec0 + 438);
for (i = 0; i < 8; i++) {
v = g_dec_be4(sec0 + 444 + i * 8);
u = g_dec_be4(sec0 + 448 + i * 8);
g_topology_lock();
error = g_slice_config(gp, i, G_SLICE_CONFIG_CHECK,
((off_t)v * csize) << 9ULL,
((off_t)u) << 9ULL,
ms->sectorsize,
"%s%c", gp->name, 'a' + i);
g_topology_unlock();
if (error)
return (error);
}
for (i = 0; i < 8; i++) {
v = g_dec_be4(sec0 + 444 + i * 8);
u = g_dec_be4(sec0 + 448 + i * 8);
g_topology_lock();
g_slice_config(gp, i, G_SLICE_CONFIG_SET,
((off_t)v * csize) << 9ULL,
((off_t)u) << 9ULL,
ms->sectorsize,
"%s%c", gp->name, 'a' + i);
g_topology_unlock();
}
ms->nalt = g_dec_be2(sec0 + 434);
ms->nheads = g_dec_be2(sec0 + 436);
ms->nsects = g_dec_be2(sec0 + 438);
return (0);
}
static int
g_sunlabel_start(struct bio *bp)
{
@ -100,7 +152,6 @@ g_sunlabel_taste(struct g_class *mp, struct g_provider *pp, int flags)
int error, i, npart;
u_char *buf;
struct g_sunlabel_softc *ms;
u_int sectorsize, u, v, csize;
off_t mediasize;
struct g_slicer *gsp;
@ -116,27 +167,18 @@ g_sunlabel_taste(struct g_class *mp, struct g_provider *pp, int flags)
g_topology_unlock();
gp->dumpconf = g_sunlabel_dumpconf;
npart = 0;
while (1) { /* a trick to allow us to use break */
do { /* a trick to allow us to use break */
if (gp->rank != 2 && flags == G_TF_NORMAL)
break;
sectorsize = cp->provider->sectorsize;
if (sectorsize < 512)
ms->sectorsize = cp->provider->sectorsize;
if (ms->sectorsize < 512)
break;
gsp->frontstuff = 16 * sectorsize;
gsp->frontstuff = 16 * ms->sectorsize;
mediasize = cp->provider->mediasize;
buf = g_read_data(cp, 0, sectorsize, &error);
buf = g_read_data(cp, 0, ms->sectorsize, &error);
if (buf == NULL || error != 0)
break;
/* The second last short is a magic number */
if (g_dec_be2(buf + 508) != 0xdabe)
break;
/* The shortword parity of the entire thing must be even */
u = 0;
for (i = 0; i < 512; i += 2)
u ^= g_dec_be2(buf + i);
if (u != 0)
break;
if (bootverbose) {
g_hexdump(buf, 128);
for (i = 0; i < 8; i++) {
@ -160,33 +202,20 @@ g_sunlabel_taste(struct g_class *mp, struct g_provider *pp, int flags)
printf("v_head %d\n", g_dec_be2(buf + 436));
printf("v_sec %d\n", g_dec_be2(buf + 438));
}
ms->nalt = g_dec_be2(buf + 434);
ms->nheads = g_dec_be2(buf + 436);
ms->nsects = g_dec_be2(buf + 438);
g_sunlabel_modify(gp, ms, buf);
csize = ms->nheads * ms->nsects;
for (i = 0; i < 8; i++) {
v = g_dec_be4(buf + 444 + i * 8);
u = g_dec_be4(buf + 448 + i * 8);
if (u == 0)
continue;
npart++;
g_topology_lock();
g_slice_config(gp, i, G_SLICE_CONFIG_SET,
((off_t)v * csize) << 9ULL,
((off_t)u) << 9ULL,
sectorsize,
"%s%c", pp->name, 'a' + i);
g_topology_unlock();
}
break;
}
} while (0);
g_topology_lock();
g_access_rel(cp, -1, 0, 0);
if (LIST_EMPTY(&gp->provider)) {
g_std_spoiled(cp);
return (NULL);
#ifdef notyet
} else {
g_slice_conf_hot(gp, 0, 0, ms->sectorsize);
#endif
}
return (gp);
}