Differential D25597 Diff 74224 sys/geom/label/g_label.c

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sys/geom/label/g_label.c

Show First 20 Lines • Show All 57 Lines • ▼ Show 20 Lines
SYSCTL_UINT(_kern_geom_label, OID_AUTO, debug, CTLFLAG_RWTUN, &g_label_debug, 0,		SYSCTL_UINT(_kern_geom_label, OID_AUTO, debug, CTLFLAG_RWTUN, &g_label_debug, 0,
"Debug level");		"Debug level");

static int g_label_destroy_geom(struct gctl_req req, struct g_class mp,		static int g_label_destroy_geom(struct gctl_req req, struct g_class mp,
struct g_geom *gp);		struct g_geom *gp);
static int g_label_destroy(struct g_geom *gp, boolean_t force);		static int g_label_destroy(struct g_geom *gp, boolean_t force);
static struct g_geom g_label_taste(struct g_class mp, struct g_provider *pp,		static struct g_geom g_label_taste(struct g_class mp, struct g_provider *pp,
int flags __unused);		int flags __unused);
		static void g_label_generic_taste(struct g_consumer , char , size_t);
static void g_label_config(struct gctl_req req, struct g_class mp,		static void g_label_config(struct gctl_req req, struct g_class mp,
const char *verb);		const char *verb);

		#define G_LABEL_DIRPREFIX "label/"

struct g_class g_label_class = {		struct g_class g_label_class = {
.name = G_LABEL_CLASS_NAME,		.name = G_LABEL_CLASS_NAME,
.version = G_VERSION,		.version = G_VERSION,
.ctlreq = g_label_config,		.ctlreq = g_label_config,
.taste = g_label_taste,		.taste = g_label_taste,
.destroy_geom = g_label_destroy_geom		.destroy_geom = g_label_destroy_geom
};		};

		static struct g_label_desc g_label_generic = {
		.ld_taste = g_label_generic_taste,
		.ld_dirprefix = G_LABEL_DIRPREFIX,
		.ld_enabled = 1
		};

/*		/*
* To add a new file system where you want to look for volume labels,		* To add a new file system where you want to look for volume labels,
* you have to:		* you have to:
* 1. Add a file g_label_<file system>.c which implements labels recognition.		* 1. Add a file g_label_<file system>.c which implements labels recognition.
* 2. Add an 'extern const struct g_label_desc g_label_<file system>;' into		* 2. Add an 'extern const struct g_label_desc g_label_<file system>;' into
* g_label.h file.		* g_label.h file.
* 3. Add an element to the table below '&g_label_<file system>,'.		* 3. Add an element to the table below '&g_label_<file system>,'.
* 4. Add your file to sys/conf/files.		* 4. Add your file to sys/conf/files.
Show All 9 Lines	#ifdef GEOM_LABEL
&g_label_iso9660,		&g_label_iso9660,
&g_label_msdosfs,		&g_label_msdosfs,
&g_label_ext2fs,		&g_label_ext2fs,
&g_label_reiserfs,		&g_label_reiserfs,
&g_label_ntfs,		&g_label_ntfs,
&g_label_disk_ident,		&g_label_disk_ident,
&g_label_flashmap,		&g_label_flashmap,
#endif		#endif
		&g_label_generic,
NULL		NULL
};		};

void		void
g_label_rtrim(char *label, size_t size)		g_label_rtrim(char *label, size_t size)
{		{
ptrdiff_t i;		ptrdiff_t i;

▲ Show 20 Lines • Show All 98 Lines • ▼ Show 20 Lines	if (sbuf_finish(sb) != 0)
label[0] = '\0';		label[0] = '\0';
else		else
strlcpy(label, sbuf_data(sb), size);		strlcpy(label, sbuf_data(sb), size);
sbuf_delete(sb);		sbuf_delete(sb);
}		}

static struct g_geom *		static struct g_geom *
g_label_create(struct gctl_req req, struct g_class mp, struct g_provider *pp,		g_label_create(struct gctl_req req, struct g_class mp, struct g_provider *pp,
const char label, const char dir, off_t mediasize)		const char label, const char dirprefix, off_t mediasize)
{		{
struct g_geom *gp;		struct g_geom *gp;
struct g_provider *pp2;		struct g_provider *pp2;
struct g_consumer *cp;		struct g_consumer *cp;
char name[64];		char name[64];

g_topology_assert();		g_topology_assert();

if (!g_label_is_name_ok(label)) {		if (!g_label_is_name_ok(label)) {
G_LABEL_DEBUG(0, "%s contains suspicious label, skipping.",		G_LABEL_DEBUG(0, "%s contains suspicious label, skipping.",
pp->name);		pp->name);
G_LABEL_DEBUG(1, "%s suspicious label is: %s", pp->name, label);		G_LABEL_DEBUG(1, "%s suspicious label is: %s", pp->name, label);
if (req != NULL)		if (req != NULL)
gctl_error(req, "Label name %s is invalid.", label);		gctl_error(req, "Label name %s is invalid.", label);
return (NULL);		return (NULL);
}		}
gp = NULL;		gp = NULL;
cp = NULL;		cp = NULL;
if (snprintf(name, sizeof(name), "%s/%s", dir, label) >= sizeof(name)) {		if (snprintf(name, sizeof(name), "%s%s", dirprefix, label) >= sizeof(name)) {
if (req != NULL)		if (req != NULL)
gctl_error(req, "Label name %s is too long.", label);		gctl_error(req, "Label name %s is too long.", label);
return (NULL);		return (NULL);
}		}
LIST_FOREACH(gp, &mp->geom, geom) {		LIST_FOREACH(gp, &mp->geom, geom) {
pp2 = LIST_FIRST(&gp->provider);		pp2 = LIST_FIRST(&gp->provider);
if (pp2 == NULL)		if (pp2 == NULL)
continue;		continue;
▲ Show 20 Lines • Show All 51 Lines • ▼ Show 20 Lines

static int		static int
g_label_read_metadata(struct g_consumer cp, struct g_label_metadata md)		g_label_read_metadata(struct g_consumer cp, struct g_label_metadata md)
{		{
struct g_provider *pp;		struct g_provider *pp;
u_char *buf;		u_char *buf;
int error;		int error;

g_topology_assert();

pp = cp->provider;		pp = cp->provider;
g_topology_unlock();
buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,		buf = g_read_data(cp, pp->mediasize - pp->sectorsize, pp->sectorsize,
&error);		&error);
g_topology_lock();
if (buf == NULL)		if (buf == NULL)
return (error);		return (error);
/* Decode metadata. */		/* Decode metadata. */
label_metadata_decode(buf, md);		label_metadata_decode(buf, md);
g_free(buf);		g_free(buf);

return (0);		return (0);
}		}
Show All 16 Lines
g_label_access_taste(struct g_provider *pp __unused, int dr __unused,		g_label_access_taste(struct g_provider *pp __unused, int dr __unused,
int dw __unused, int de __unused)		int dw __unused, int de __unused)
{		{

KASSERT(1 == 0, ("%s called", __func__));		KASSERT(1 == 0, ("%s called", __func__));
return (EOPNOTSUPP);		return (EOPNOTSUPP);
}		}

		static void
		g_label_generic_taste(struct g_consumer cp, char label, size_t size)
		{
		struct g_provider *pp;
		struct g_label_metadata md;

		g_topology_assert_not();
		label[0] = '\0';
		pp = cp->provider;

		if (g_label_read_metadata(cp, &md) != 0)
		return;

		if (strcmp(md.md_magic, G_LABEL_MAGIC) != 0)
		return;

		if (md.md_version > G_LABEL_VERSION) {
		printf("geom_label.ko module is too old to handle %s.\n",
		pp->name);
		return;
		}
		/*
		* Backward compatibility: there was no md_provsize field in
		* earlier versions of metadata, so only check if we have it.
		*/
		if (md.md_version >= 2 && md.md_provsize != pp->mediasize)
		return;

		strlcpy(label, md.md_label, size);
		}

static struct g_geom *		static struct g_geom *
g_label_taste(struct g_class mp, struct g_provider pp, int flags __unused)		g_label_taste(struct g_class mp, struct g_provider pp, int flags __unused)
{		{
struct g_label_metadata md;
struct g_consumer *cp;		struct g_consumer *cp;
struct g_geom *gp;		struct g_geom *gp;
		off_t mediasize;
int i;		int i;

g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);		g_trace(G_T_TOPOLOGY, "%s(%s, %s)", __func__, mp->name, pp->name);
g_topology_assert();		g_topology_assert();

G_LABEL_DEBUG(2, "Tasting %s.", pp->name);		G_LABEL_DEBUG(2, "Tasting %s.", pp->name);

/* Skip providers that are already open for writing. */		/* Skip providers that are already open for writing. */
if (pp->acw > 0)		if (pp->acw > 0)
return (NULL);		return (NULL);

if (strcmp(pp->geom->class->name, mp->name) == 0)		if (strcmp(pp->geom->class->name, mp->name) == 0)
return (NULL);		return (NULL);

gp = g_new_geomf(mp, "label:taste");		gp = g_new_geomf(mp, "label:taste");
gp->start = g_label_start_taste;		gp->start = g_label_start_taste;
gp->access = g_label_access_taste;		gp->access = g_label_access_taste;
gp->orphan = g_label_orphan_taste;		gp->orphan = g_label_orphan_taste;
cp = g_new_consumer(gp);		cp = g_new_consumer(gp);
g_attach(cp, pp);		g_attach(cp, pp);
if (g_access(cp, 1, 0, 0) != 0)		if (g_access(cp, 1, 0, 0) != 0)
goto end;		goto end;
do {
if (g_label_read_metadata(cp, &md) != 0)
break;
if (strcmp(md.md_magic, G_LABEL_MAGIC) != 0)
break;
if (md.md_version > G_LABEL_VERSION) {
printf("geom_label.ko module is too old to handle %s.\n",
pp->name);
break;
}

/*
* Backward compatibility:
*/
/*
* There was no md_provsize field in earlier versions of
* metadata.
*/
if (md.md_version < 2)
md.md_provsize = pp->mediasize;

if (md.md_provsize != pp->mediasize)
break;

g_label_create(NULL, mp, pp, md.md_label, G_LABEL_DIR,
pp->mediasize - pp->sectorsize);
} while (0);
for (i = 0; g_labels[i] != NULL; i++) {		for (i = 0; g_labels[i] != NULL; i++) {
char label[128];		char label[128];

if (g_labels[i]->ld_enabled == 0)		if (g_labels[i]->ld_enabled == 0)
continue;		continue;
g_topology_unlock();		g_topology_unlock();
g_labels[i]->ld_taste(cp, label, sizeof(label));		g_labels[i]->ld_taste(cp, label, sizeof(label));
g_label_mangle_name(label, sizeof(label));		g_label_mangle_name(label, sizeof(label));
g_topology_lock();		g_topology_lock();
if (label[0] == '\0')		if (label[0] == '\0')
continue;		continue;
g_label_create(NULL, mp, pp, label, g_labels[i]->ld_dir,		if (g_labels[i] != &g_label_generic) {
pp->mediasize);		mediasize = pp->mediasize;
		} else {
		mediasize = pp->mediasize - pp->sectorsize;
		cemUnsubmitted Done Inline Actions It might be nice to encode this in the `g_labels[]` table somehow instead. cem: It might be nice to encode this in the `g_labels[]` table somehow instead.
}		}
		g_label_create(NULL, mp, pp, label,
		g_labels[i]->ld_dirprefix, mediasize);
		}
g_access(cp, -1, 0, 0);		g_access(cp, -1, 0, 0);
end:		end:
g_detach(cp);		g_detach(cp);
g_destroy_consumer(cp);		g_destroy_consumer(cp);
g_destroy_geom(gp);		g_destroy_geom(gp);
return (NULL);		return (NULL);
}		}

Show All 34 Lines	g_label_ctl_create(struct gctl_req req, struct g_class mp)
/*		/*
* arg0 is the label.		* arg0 is the label.
*/		*/
name = gctl_get_asciiparam(req, "arg0");		name = gctl_get_asciiparam(req, "arg0");
if (name == NULL) {		if (name == NULL) {
gctl_error(req, "No 'arg%d' argument", 0);		gctl_error(req, "No 'arg%d' argument", 0);
return;		return;
}		}
g_label_create(req, mp, pp, name, G_LABEL_DIR, pp->mediasize);		g_label_create(req, mp, pp, name, G_LABEL_DIRPREFIX, pp->mediasize);
}		}

static const char *		static const char *
g_label_skip_dir(const char *name)		g_label_skip_dir(const char *name)
{		{
char path[64];
u_int i;		u_int i;

if (strncmp(name, _PATH_DEV, strlen(_PATH_DEV)) == 0)		if (strncmp(name, _PATH_DEV, strlen(_PATH_DEV)) == 0)
name += strlen(_PATH_DEV);		name += strlen(_PATH_DEV);
if (strncmp(name, G_LABEL_DIR "/", strlen(G_LABEL_DIR "/")) == 0)
name += strlen(G_LABEL_DIR "/");
for (i = 0; g_labels[i] != NULL; i++) {		for (i = 0; g_labels[i] != NULL; i++) {
snprintf(path, sizeof(path), "%s/", g_labels[i]->ld_dir);		if (strncmp(name, g_labels[i]->ld_dirprefix,
if (strncmp(name, path, strlen(path)) == 0) {		strlen(g_labels[i]->ld_dirprefix)) == 0) {
name += strlen(path);		name += strlen(g_labels[i]->ld_dirprefix);
break;		break;
}		}
}		}
return (name);		return (name);
}		}

static struct g_geom *		static struct g_geom *
g_label_find_geom(struct g_class mp, const char name)		g_label_find_geom(struct g_class mp, const char name)
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