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c072011223
implementation, error on the side of conservatism and only create labels for GEOMs of classes DISK and MULTIPATH. Discussed with: trasz Approved by: silence from freebsd-geom@
118 lines
3.8 KiB
C
118 lines
3.8 KiB
C
/*-
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* Copyright (c) 2004-2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _G_LABEL_H_
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#define _G_LABEL_H_
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#include <sys/endian.h>
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#ifdef _KERNEL
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#include <sys/sysctl.h>
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#endif
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#define G_LABEL_CLASS_NAME "LABEL"
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#define G_LABEL_MAGIC "GEOM::LABEL"
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/*
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* Version history:
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* 1 - Initial version number.
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* 2 - Added md_provsize field to metadata.
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*/
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#define G_LABEL_VERSION 2
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#define G_LABEL_DIR "label"
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#ifdef _KERNEL
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extern u_int g_label_debug;
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#define G_LABEL_DEBUG(lvl, ...) do { \
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if (g_label_debug >= (lvl)) { \
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printf("GEOM_LABEL"); \
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if (g_label_debug > 0) \
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printf("[%u]", lvl); \
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printf(": "); \
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printf(__VA_ARGS__); \
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printf("\n"); \
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} \
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} while (0)
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SYSCTL_DECL(_kern_geom_label);
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#define G_LABEL_INIT(kind, label, descr) \
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SYSCTL_NODE(_kern_geom_label, OID_AUTO, kind, CTLFLAG_RD, \
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NULL, ""); \
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SYSCTL_INT(_kern_geom_label_##kind, OID_AUTO, enable, \
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CTLFLAG_RW, &label.ld_enabled, 1, descr); \
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TUNABLE_INT("kern.geom.label." __XSTRING(kind) ".enable", \
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&label.ld_enabled)
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typedef void g_label_taste_t (struct g_consumer *cp, char *label, size_t size);
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struct g_label_desc {
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g_label_taste_t *ld_taste;
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char *ld_dir;
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int ld_enabled;
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};
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/* Supported labels. */
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extern struct g_label_desc g_label_ufs_id;
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extern struct g_label_desc g_label_ufs_volume;
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extern struct g_label_desc g_label_iso9660;
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extern struct g_label_desc g_label_msdosfs;
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extern struct g_label_desc g_label_ext2fs;
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extern struct g_label_desc g_label_reiserfs;
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extern struct g_label_desc g_label_ntfs;
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extern struct g_label_desc g_label_gpt;
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extern struct g_label_desc g_label_gpt_uuid;
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extern struct g_label_desc g_label_disk_ident;
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#endif /* _KERNEL */
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struct g_label_metadata {
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char md_magic[16]; /* Magic value. */
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uint32_t md_version; /* Version number. */
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char md_label[16]; /* Label. */
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uint64_t md_provsize; /* Provider's size. */
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};
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static __inline void
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label_metadata_encode(const struct g_label_metadata *md, u_char *data)
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{
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bcopy(md->md_magic, data, sizeof(md->md_magic));
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le32enc(data + 16, md->md_version);
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bcopy(md->md_label, data + 20, sizeof(md->md_label));
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le64enc(data + 36, md->md_provsize);
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}
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static __inline void
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label_metadata_decode(const u_char *data, struct g_label_metadata *md)
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{
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bcopy(data, md->md_magic, sizeof(md->md_magic));
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md->md_version = le32dec(data + 16);
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bcopy(data + 20, md->md_label, sizeof(md->md_label));
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md->md_provsize = le64dec(data + 36);
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}
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#endif /* _G_LABEL_H_ */
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