static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
{
struct super_block *sb = sdp->sd_vfs;
struct gfs2_sb *p;
struct page *page;
struct bio *bio;
page = alloc_page(GFP_NOFS);
if (unlikely(!page))
return -ENOBUFS;
ClearPageUptodate(page);
ClearPageDirty(page);
lock_page(page);
bio = bio_alloc(GFP_NOFS, 1);
bio->bi_sector = sector * (sb->s_blocksize >> 9);
bio->bi_bdev = sb->s_bdev;
bio_add_page(bio, page, PAGE_SIZE, 0);
bio->bi_end_io = end_bio_io_page;
bio->bi_private = page;
submit_bio(READ_SYNC | REQ_META, bio);
wait_on_page_locked(page);
bio_put(bio);
if (!PageUptodate(page)) {
__free_page(page);
return -EIO;
}
p = kmap(page);
gfs2_sb_in(sdp, p);
kunmap(page);
__free_page(page);
return gfs2_check_sb(sdp, silent);
}
int get_sb(char *device, struct gen_sb *sb_out)
{
int fd;
fd = open(device, O_RDONLY);
if (fd < 0)
die("can't open %s: %s\n", device, strerror(errno));
if (!strcmp(fsname, "gfs2")) {
char buf[GFS2_BASIC_BLOCK];
struct gfs2_sb sb;
if (lseek(fd, GFS2_SB_ADDR * GFS2_BASIC_BLOCK, SEEK_SET) !=
GFS2_SB_ADDR * GFS2_BASIC_BLOCK) {
fprintf(stderr, "bad seek: %s from %s:%d: "
"superblock\n",
strerror(errno), __FUNCTION__, __LINE__);
exit(-1);
}
do_read(fd, buf, GFS2_BASIC_BLOCK);
gfs2_sb_in(&sb, buf);
if (sb.sb_header.mh_magic != GFS2_MAGIC ||
sb.sb_header.mh_type != GFS2_METATYPE_SB) {
die("there isn't a GFS2 filesystem on %s, "
"magic=%x type=%x\n", device,
sb.sb_header.mh_magic, sb.sb_header.mh_type);
}
if (sb.sb_fs_format != GFS2_FORMAT_FS ||
sb.sb_multihost_format != GFS2_FORMAT_MULTI) {
die("there appears to be a GFS, not GFS2, filesystem "
"on %s\n", device);
}
strncpy(sb_out->lockproto, sb.sb_lockproto, 256);
strncpy(sb_out->locktable, sb.sb_locktable, 256);
} else if (!strcmp(fsname, "gfs")) {
char buf[GFS_BASIC_BLOCK];
struct gfs_sb sb;
if (lseek(fd, GFS_SB_ADDR * GFS_BASIC_BLOCK, SEEK_SET) !=
GFS_SB_ADDR * GFS_BASIC_BLOCK) {
fprintf(stderr, "bad seek: %s from %s:%d: "
"superblock\n",
strerror(errno), __FUNCTION__, __LINE__);
exit(-1);
}
do_read(fd, buf, GFS2_BASIC_BLOCK);
gfs_sb_in(&sb, buf);
if (sb.sb_header.mh_magic != GFS_MAGIC ||
sb.sb_header.mh_type != GFS_METATYPE_SB) {
die("there isn't a GFS filesystem on %s\n", device);
}
if (sb.sb_fs_format != GFS_FORMAT_FS ||
sb.sb_multihost_format != GFS_FORMAT_MULTI) {
die("there appears to be a GFS2, not GFS, filesystem "
"on %s\n", device);
}
strncpy(sb_out->lockproto, sb.sb_lockproto, 256);
strncpy(sb_out->locktable, sb.sb_locktable, 256);
}
close(fd);
return 0;
}
int display_gfs2(struct gfs2_buffer_head *dbh)
{
struct gfs2_meta_header mh;
struct gfs2_rgrp rg;
struct gfs2_leaf lf;
struct gfs_log_header lh1;
struct gfs2_log_header lh;
struct gfs2_log_descriptor ld;
struct gfs2_quota_change qc;
uint32_t magic;
magic = be32_to_cpu(*(uint32_t *)dbh->b_data);
switch (magic)
{
case GFS2_MAGIC:
gfs2_meta_header_in(&mh, dbh);
if (mh.mh_type > GFS2_METATYPE_QC)
print_gfs2("Unknown metadata type");
else
print_gfs2("%s:", block_type_str[mh.mh_type]);
eol(0);
switch (mh.mh_type)
{
case GFS2_METATYPE_SB:
gfs2_sb_in(&sbd.sd_sb, dbh);
gfs2_sb_print2(&sbd.sd_sb);
break;
case GFS2_METATYPE_RG:
if (sbd.gfs1) {
struct gfs_rgrp rg1;
gfs1_rgrp_in(&rg1, dbh);
gfs1_rgrp_print(&rg1);
} else {
gfs2_rgrp_in(&rg, dbh);
gfs2_rgrp_print(&rg);
}
break;
case GFS2_METATYPE_RB:
gfs2_meta_header_print(&mh);
break;
case GFS2_METATYPE_DI:
gfs2_dinode_print(&di);
break;
case GFS2_METATYPE_IN:
gfs2_meta_header_print(&mh);
break;
case GFS2_METATYPE_LF:
gfs2_leaf_in(&lf, dbh);
gfs2_leaf_print(&lf);
break;
case GFS2_METATYPE_JD:
gfs2_meta_header_print(&mh);
break;
case GFS2_METATYPE_LH:
if (sbd.gfs1) {
gfs_log_header_in(&lh1, dbh);
gfs_log_header_print(&lh1);
} else {
gfs2_log_header_in(&lh, dbh);
gfs2_log_header_print(&lh);
}
break;
case GFS2_METATYPE_LD:
gfs2_log_descriptor_in(&ld, dbh);
gfs2_log_descriptor_print(&ld);
break;
case GFS2_METATYPE_EA:
do_eattr_extended(dbh);
break;
case GFS2_METATYPE_ED:
gfs2_meta_header_print(&mh);
break;
case GFS2_METATYPE_LB:
gfs2_meta_header_print(&mh);
break;
case GFS2_METATYPE_QC:
gfs2_quota_change_in(&qc, dbh);
gfs2_quota_change_print(&qc);
break;
default:
break;
}
break;
default:
print_gfs2("Unknown block type");
eol(0);
break;
};
return(0);
}
