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Add support for labels derived from GPT metadata.

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Approved by:	gnn (mentor)
Reviewed by:	pjd
PR:		128398
Submitted by:	Marius Nuennerich < marius at nuenneri.ch >
This commit is contained in:
Ivan Voras 2009-06-13 00:27:03 +00:00
parent 570706f8ad
commit 452f657cb9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=194092
5 changed files with 183 additions and 2 deletions
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16
sbin/geom/class/label/glabel.8
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@ -1,4 +1,5 @@
.\" Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
.\" Copyright (c) 2008-2009 Ivan Voras <ivoras@FreeBSD.org>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
@ -24,7 +25,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd July 2, 2004
.Dd June 13, 2009
.Dt GLABEL 8
.Os
.Sh NAME
@ -119,7 +120,18 @@ NTFS (directory
.Pa /dev/ntfs/ ) .
.El
.Pp
Non file-system labels are created in the directory
Support for partition metadata is implemented for:
.Pp
.Bl -bullet -offset indent -compact
.It
GPT labels (directory
.Pa /dev/gpt/ ) .
.It
GPT UUIDs (directory
.Pa /dev/gptid/ ) .
.El
.Pp
Generic labels are created in the directory
.Pa /dev/label/ .
.Pp
The first argument to

1
sys/conf/files
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@ -1852,6 +1852,7 @@ geom/label/g_label_msdosfs.c optional geom_label
geom/label/g_label_ntfs.c optional geom_label
geom/label/g_label_reiserfs.c optional geom_label
geom/label/g_label_ufs.c optional geom_label
geom/label/g_label_gpt.c optional geom_label
geom/linux_lvm/g_linux_lvm.c optional geom_linux_lvm
geom/mirror/g_mirror.c optional geom_mirror
geom/mirror/g_mirror_ctl.c optional geom_mirror

2
sys/geom/label/g_label.c
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@ -84,6 +84,8 @@ const struct g_label_desc *g_labels[] = {
&g_label_ext2fs,
&g_label_reiserfs,
&g_label_ntfs,
&g_label_gpt,
&g_label_gpt_uuid,
NULL
};

2
sys/geom/label/g_label.h
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@ -71,6 +71,8 @@ extern const struct g_label_desc g_label_msdosfs;
extern const struct g_label_desc g_label_ext2fs;
extern const struct g_label_desc g_label_reiserfs;
extern const struct g_label_desc g_label_ntfs;
extern const struct g_label_desc g_label_gpt;
extern const struct g_label_desc g_label_gpt_uuid;
#endif /* _KERNEL */
struct g_label_metadata {

164
sys/geom/label/g_label_gpt.c Normal file
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@ -0,0 +1,164 @@
/*-
* Copyright (c) 2008 Marius Nuennerich
* 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 AUTHOR 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 AUTHOR 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("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/kobj.h>
#include <sys/gpt.h>
#include <geom/geom.h>
#include <geom/label/g_label.h>
#include <geom/part/g_part.h>
#define PART_CLASS_NAME "PART"
#define SCHEME_NAME "GPT"
#define G_LABEL_GPT_VOLUME_DIR "gpt"
#define G_LABEL_GPT_ID_DIR "gptid"
/* also defined in geom/part/g_part_gpt.c */
struct g_part_gpt_entry {
struct g_part_entry base;
struct gpt_ent ent;
};
/* shamelessly stolen from g_part_gpt.c */
static void
sbuf_nprintf_utf16(struct sbuf *sb, uint16_t *str, size_t len)
{
u_int bo;
uint32_t ch;
uint16_t c;
bo = LITTLE_ENDIAN; /* GPT is little-endian */
while (len > 0 && *str != 0) {
ch = (bo == BIG_ENDIAN) ? be16toh(*str) : le16toh(*str);
str++, len--;
if ((ch & 0xf800) == 0xd800) {
if (len > 0) {
c = (bo == BIG_ENDIAN) ? be16toh(*str)
: le16toh(*str);
str++, len--;
} else
c = 0xfffd;
if ((ch & 0x400) == 0 && (c & 0xfc00) == 0xdc00) {
ch = ((ch & 0x3ff) << 10) + (c & 0x3ff);
ch += 0x10000;
} else
ch = 0xfffd;
} else if (ch == 0xfffe) { /* BOM (U+FEFF) swapped. */
bo = (bo == BIG_ENDIAN) ? LITTLE_ENDIAN : BIG_ENDIAN;
continue;
} else if (ch == 0xfeff) /* BOM (U+FEFF) unswapped. */
continue;
/* Write the Unicode character in UTF-8 */
if (ch < 0x80)
sbuf_printf(sb, "%c", ch);
else if (ch < 0x800)
sbuf_printf(sb, "%c%c", 0xc0 | (ch >> 6),
0x80 | (ch & 0x3f));
else if (ch < 0x10000)
sbuf_printf(sb, "%c%c%c", 0xe0 | (ch >> 12),
0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f));
else if (ch < 0x200000)
sbuf_printf(sb, "%c%c%c%c", 0xf0 | (ch >> 18),
0x80 | ((ch >> 12) & 0x3f),
0x80 | ((ch >> 6) & 0x3f), 0x80 | (ch & 0x3f));
}
}
static void
g_label_gpt_taste(struct g_consumer *cp, char *label, size_t size)
{
struct g_provider *pp;
struct g_part_table *tp;
struct g_part_gpt_entry *part_gpt_entry;
struct sbuf *lbl;
g_topology_assert_not();
pp = cp->provider;
tp = (struct g_part_table *)pp->geom->softc;
label[0] = '\0';
/* We taste only partitions from GPART */
if (strncmp(pp->geom->class->name, PART_CLASS_NAME, sizeof(PART_CLASS_NAME)))
return;
/* and only GPT */
if (strncmp(tp->gpt_scheme->name, SCHEME_NAME, sizeof(SCHEME_NAME)))
return;
part_gpt_entry = (struct g_part_gpt_entry *)pp->private;
/*
* create sbuf with biggest possible size
* we need max. 4 bytes for every 2-byte utf16 char
*/
lbl = sbuf_new(NULL, NULL, sizeof(part_gpt_entry->ent.ent_name) << 1, SBUF_FIXEDLEN);
/* size ist the number of characters, not bytes */
sbuf_nprintf_utf16(lbl, part_gpt_entry->ent.ent_name, sizeof(part_gpt_entry->ent.ent_name) >> 1);
sbuf_finish(lbl);
strlcpy(label, sbuf_data(lbl), size);
sbuf_delete(lbl);
}
static void
g_label_gpt_uuid_taste(struct g_consumer *cp, char *label, size_t size)
{
struct g_provider *pp;
struct g_part_table *tp;
struct g_part_gpt_entry *part_gpt_entry;
g_topology_assert_not();
pp = cp->provider;
tp = (struct g_part_table *)pp->geom->softc;
label[0] = '\0';
/* we taste only partitions from GPART */
if (strncmp(pp->geom->class->name, PART_CLASS_NAME, sizeof(PART_CLASS_NAME)))
return;
/* and only GPT */
if (strncmp(tp->gpt_scheme->name, SCHEME_NAME, sizeof(SCHEME_NAME)))
return;
part_gpt_entry = (struct g_part_gpt_entry *)pp->private;
snprintf_uuid(label, size, &part_gpt_entry->ent.ent_uuid);
}
const struct g_label_desc g_label_gpt = {
.ld_taste = g_label_gpt_taste,
.ld_dir = G_LABEL_GPT_VOLUME_DIR
};
const struct g_label_desc g_label_gpt_uuid = {
.ld_taste = g_label_gpt_uuid_taste,
.ld_dir = G_LABEL_GPT_ID_DIR
};