errcode_t ocfs2_clear_backup_super_list(ocfs2_filesys *fs,
uint64_t *blocks, size_t len)
{
size_t i;
errcode_t ret = 0;
if (!len || !blocks || !*blocks)
goto bail;
len = ocfs2_min(len,(size_t)OCFS2_MAX_BACKUP_SUPERBLOCKS);
/*
* Don't clear anything if backup superblocks aren't enabled -
* there might be real data there! If backup superblocks are
* enabled, we know these blocks are backups, and we're
* safe to clear them.
*/
if (!OCFS2_HAS_COMPAT_FEATURE(OCFS2_RAW_SB(fs->fs_super),
OCFS2_FEATURE_COMPAT_BACKUP_SB))
goto bail;
for (i = 0; i < len; i++) {
ret = ocfs2_free_clusters(fs, 1, blocks[i]);
if (ret)
break;
}
bail:
return ret;
}
errcode_t ocfs2_set_backup_super_list(ocfs2_filesys *fs,
uint64_t *blocks, size_t len)
{
size_t i;
errcode_t ret = 0;
char *buf = NULL;
uint64_t *blkno = blocks;
uint32_t cluster, bpc = fs->fs_clustersize / fs->fs_blocksize;
if (!len || !blocks || !*blocks)
goto bail;
len = ocfs2_min(len,(size_t)OCFS2_MAX_BACKUP_SUPERBLOCKS);
if (!OCFS2_HAS_COMPAT_FEATURE(OCFS2_RAW_SB(fs->fs_super),
OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
/* check all the blkno to see whether it is used. */
for (i = 0; i < len; i++, blkno++) {
ret = check_cluster(fs,
ocfs2_blocks_to_clusters(fs, *blkno));
if (ret)
goto bail;
}
}
ret = ocfs2_malloc_blocks(fs->fs_io, bpc, &buf);
if (ret)
goto bail;
memset(buf, 0, fs->fs_clustersize);
/* zero all the clusters at first */
blkno = blocks;
for (i = 0; i < len; i++, blkno++) {
cluster = ocfs2_blocks_to_clusters(fs, *blkno);
ret = io_write_block(fs->fs_io, cluster*bpc, bpc, buf);
if (ret)
goto bail;
}
ret = ocfs2_refresh_backup_super_list(fs, blocks, len);
if (ret)
goto bail;
/* We just tested the clusters, so the allocation can't fail */
blkno = blocks;
for (i = 0; i < len; i++, blkno++)
ocfs2_new_specific_cluster(fs, ocfs2_blocks_to_clusters(fs, *blkno));
bail:
if (buf)
ocfs2_free(&buf);
return ret;
}
errcode_t ocfs2_refresh_backup_supers(ocfs2_filesys *fs)
{
int num;
uint64_t blocks[OCFS2_MAX_BACKUP_SUPERBLOCKS];
if (!OCFS2_HAS_COMPAT_FEATURE(OCFS2_RAW_SB(fs->fs_super),
OCFS2_FEATURE_COMPAT_BACKUP_SB))
return 0; /* Do nothing */
num = ocfs2_get_backup_super_offsets(fs, blocks,
ARRAY_SIZE(blocks));
return num ? ocfs2_refresh_backup_super_list(fs, blocks, num) : 0;
}
static int enable_backup_super(ocfs2_filesys *fs, int flags)
{
errcode_t err = 0;
struct ocfs2_super_block *super = OCFS2_RAW_SB(fs->fs_super);
struct tools_progress *prog;
if (OCFS2_HAS_COMPAT_FEATURE(super,
OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
verbosef(VL_APP,
"Backup superblock feature is already enabled; "
"nothing to enable\n");
goto out;
}
if (!tools_interact("Enable the backup superblock feature on "
"device \"%s\"? ",
fs->fs_devname))
goto out;
prog = tools_progress_start("Enable backup-super", "backup-super",
2);
if (!prog) {
err = TUNEFS_ET_NO_MEMORY;
tcom_err(err, "while initializing the progress display");
goto out;
}
tunefs_block_signals();
err = check_backup_offsets(fs);
tools_progress_step(prog, 1);
if (!err)
err = fill_backup_supers(fs);
if (!err) {
super->s_feature_compat |= OCFS2_FEATURE_COMPAT_BACKUP_SB;
err = ocfs2_write_super(fs);
if (err)
tcom_err(err, "while writing out the superblock\n");
}
tunefs_unblock_signals();
tools_progress_step(prog, 1);
tools_progress_stop(prog);
if (err)
errorf("Unable to enable the backup superblock feature on "
"device \"%s\"\n",
fs->fs_devname);
out:
return err;
}
errcode_t ocfs2_read_backup_super(ocfs2_filesys *fs, int backup, char *sbbuf)
{
int numsb;
uint64_t blocks[OCFS2_MAX_BACKUP_SUPERBLOCKS];
if (!OCFS2_HAS_COMPAT_FEATURE(OCFS2_RAW_SB(fs->fs_super),
OCFS2_FEATURE_COMPAT_BACKUP_SB))
return OCFS2_ET_NO_BACKUP_SUPER;
numsb = ocfs2_get_backup_super_offsets(fs, blocks,
ARRAY_SIZE(blocks));
if (backup < 0 || backup >= numsb)
return OCFS2_ET_NO_BACKUP_SUPER;
return ocfs2_read_super(fs, blocks[backup], sbbuf);
}
static void ocfs2_update_super_and_backups(struct inode *inode,
int new_clusters)
{
int ret;
u32 clusters = 0;
struct buffer_head *super_bh = NULL;
struct ocfs2_dinode *super_di = NULL;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
/*
* update the superblock last.
* It doesn't matter if the write failed.
*/
ret = ocfs2_read_blocks_sync(osb, OCFS2_SUPER_BLOCK_BLKNO, 1,
&super_bh);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
super_di = (struct ocfs2_dinode *)super_bh->b_data;
le32_add_cpu(&super_di->i_clusters, new_clusters);
clusters = le32_to_cpu(super_di->i_clusters);
ret = ocfs2_write_super_or_backup(osb, super_bh);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
if (OCFS2_HAS_COMPAT_FEATURE(osb->sb, OCFS2_FEATURE_COMPAT_BACKUP_SB))
ret = update_backups(inode, clusters, super_bh->b_data);
out:
brelse(super_bh);
if (ret)
printk(KERN_WARNING "ocfs2: Failed to update super blocks on %s"
" during fs resize. This condition is not fatal,"
" but fsck.ocfs2 should be run to fix it\n",
osb->dev_str);
return;
}
static int ocfs2_update_last_group_and_inode(handle_t *handle,
struct inode *bm_inode,
struct buffer_head *bm_bh,
struct buffer_head *group_bh,
u32 first_new_cluster,
int new_clusters)
{
int ret = 0;
struct ocfs2_super *osb = OCFS2_SB(bm_inode->i_sb);
struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bm_bh->b_data;
struct ocfs2_chain_list *cl = &fe->id2.i_chain;
struct ocfs2_chain_rec *cr;
struct ocfs2_group_desc *group;
u16 chain, num_bits, backups = 0;
u16 cl_bpc = le16_to_cpu(cl->cl_bpc);
u16 cl_cpg = le16_to_cpu(cl->cl_cpg);
trace_ocfs2_update_last_group_and_inode(new_clusters,
first_new_cluster);
ret = ocfs2_journal_access_gd(handle, INODE_CACHE(bm_inode),
group_bh, OCFS2_JOURNAL_ACCESS_WRITE);
if (ret < 0) {
mlog_errno(ret);
goto out;
}
group = (struct ocfs2_group_desc *)group_bh->b_data;
/* update the group first. */
num_bits = new_clusters * cl_bpc;
le16_add_cpu(&group->bg_bits, num_bits);
le16_add_cpu(&group->bg_free_bits_count, num_bits);
/*
* check whether there are some new backup superblocks exist in
* this group and update the group bitmap accordingly.
*/
if (OCFS2_HAS_COMPAT_FEATURE(osb->sb,
OCFS2_FEATURE_COMPAT_BACKUP_SB)) {
backups = ocfs2_calc_new_backup_super(bm_inode,
group,
new_clusters,
first_new_cluster,
cl_cpg, 1);
le16_add_cpu(&group->bg_free_bits_count, -1 * backups);
}
ocfs2_journal_dirty(handle, group_bh);
/* update the inode accordingly. */
ret = ocfs2_journal_access_di(handle, INODE_CACHE(bm_inode), bm_bh,
OCFS2_JOURNAL_ACCESS_WRITE);
if (ret < 0) {
mlog_errno(ret);
goto out_rollback;
}
chain = le16_to_cpu(group->bg_chain);
cr = (&cl->cl_recs[chain]);
le32_add_cpu(&cr->c_total, num_bits);
le32_add_cpu(&cr->c_free, num_bits);
le32_add_cpu(&fe->id1.bitmap1.i_total, num_bits);
le32_add_cpu(&fe->i_clusters, new_clusters);
if (backups) {
le32_add_cpu(&cr->c_free, -1 * backups);
le32_add_cpu(&fe->id1.bitmap1.i_used, backups);
}
spin_lock(&OCFS2_I(bm_inode)->ip_lock);
OCFS2_I(bm_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
le64_add_cpu(&fe->i_size, new_clusters << osb->s_clustersize_bits);
spin_unlock(&OCFS2_I(bm_inode)->ip_lock);
i_size_write(bm_inode, le64_to_cpu(fe->i_size));
ocfs2_journal_dirty(handle, bm_bh);
out_rollback:
if (ret < 0) {
ocfs2_calc_new_backup_super(bm_inode,
group,
new_clusters,
first_new_cluster,
cl_cpg, 0);
le16_add_cpu(&group->bg_free_bits_count, backups);
le16_add_cpu(&group->bg_bits, -1 * num_bits);
le16_add_cpu(&group->bg_free_bits_count, -1 * num_bits);
}
out:
if (ret)
mlog_errno(ret);
return ret;
}
