132 lines
3.0 KiB
C
132 lines
3.0 KiB
C
/*
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* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
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*
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* This file may be redistributed under the terms of the
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* GNU Lesser General Public License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdint.h>
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#include "superblocks.h"
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/* Common gfs/gfs2 constants: */
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#define GFS_LOCKNAME_LEN 64
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/* gfs1 constants: */
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#define GFS_FORMAT_FS 1309
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#define GFS_FORMAT_MULTI 1401
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/* gfs2 constants: */
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#define GFS2_FORMAT_FS 1801
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#define GFS2_FORMAT_MULTI 1900
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struct gfs2_meta_header {
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uint32_t mh_magic;
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uint32_t mh_type;
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uint64_t __pad0; /* Was generation number in gfs1 */
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uint32_t mh_format;
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uint32_t __pad1; /* Was incarnation number in gfs1 */
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};
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struct gfs2_inum {
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uint64_t no_formal_ino;
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uint64_t no_addr;
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};
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struct gfs2_sb {
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struct gfs2_meta_header sb_header;
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uint32_t sb_fs_format;
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uint32_t sb_multihost_format;
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uint32_t __pad0; /* Was superblock flags in gfs1 */
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uint32_t sb_bsize;
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uint32_t sb_bsize_shift;
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uint32_t __pad1; /* Was journal segment size in gfs1 */
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struct gfs2_inum sb_master_dir; /* Was jindex dinode in gfs1 */
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struct gfs2_inum __pad2; /* Was rindex dinode in gfs1 */
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struct gfs2_inum sb_root_dir;
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char sb_lockproto[GFS_LOCKNAME_LEN];
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char sb_locktable[GFS_LOCKNAME_LEN];
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struct gfs2_inum __pad3; /* Was quota inode in gfs1 */
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struct gfs2_inum __pad4; /* Was licence inode in gfs1 */
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uint8_t sb_uuid[16]; /* The UUID maybe 0 for backwards compat */
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} __attribute__((packed));
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static int probe_gfs(blkid_probe pr, const struct blkid_idmag *mag)
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{
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struct gfs2_sb *sbd;
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sbd = blkid_probe_get_sb(pr, mag, struct gfs2_sb);
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if (!sbd)
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return -1;
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if (be32_to_cpu(sbd->sb_fs_format) == GFS_FORMAT_FS &&
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be32_to_cpu(sbd->sb_multihost_format) == GFS_FORMAT_MULTI)
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{
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if (*sbd->sb_locktable)
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blkid_probe_set_label(pr,
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(unsigned char *) sbd->sb_locktable,
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sizeof(sbd->sb_locktable));
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blkid_probe_set_uuid(pr, sbd->sb_uuid);
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return 0;
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}
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return -1;
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}
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static int probe_gfs2(blkid_probe pr, const struct blkid_idmag *mag)
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{
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struct gfs2_sb *sbd;
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sbd = blkid_probe_get_sb(pr, mag, struct gfs2_sb);
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if (!sbd)
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return -1;
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if (be32_to_cpu(sbd->sb_fs_format) == GFS2_FORMAT_FS &&
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be32_to_cpu(sbd->sb_multihost_format) == GFS2_FORMAT_MULTI)
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{
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if (*sbd->sb_locktable)
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blkid_probe_set_label(pr,
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(unsigned char *) sbd->sb_locktable,
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sizeof(sbd->sb_locktable));
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blkid_probe_set_uuid(pr, sbd->sb_uuid);
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blkid_probe_set_version(pr, "1");
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return 0;
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}
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return -1;
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}
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const struct blkid_idinfo gfs_idinfo =
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{
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.name = "gfs",
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.usage = BLKID_USAGE_FILESYSTEM,
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.probefunc = probe_gfs,
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.minsz = 32 * 1024 * 1024, /* minimal size of GFS journal */
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.magics =
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{
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{ .magic = "\x01\x16\x19\x70", .len = 4, .kboff = 64 },
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{ NULL }
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}
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};
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const struct blkid_idinfo gfs2_idinfo =
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{
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.name = "gfs2",
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.usage = BLKID_USAGE_FILESYSTEM,
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.probefunc = probe_gfs2,
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.minsz = 32 * 1024 * 1024, /* minimal size of GFS journal */
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.magics =
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{
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{ .magic = "\x01\x16\x19\x70", .len = 4, .kboff = 64 },
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{ NULL }
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}
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};
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