static struct buffer_head *
ocfs2_block_group_alloc_contig(struct ocfs2_super *osb, handle_t *handle,
struct inode *alloc_inode,
struct ocfs2_alloc_context *ac,
struct ocfs2_chain_list *cl)
{
int status;
u32 bit_off, num_bits;
u64 bg_blkno;
struct buffer_head *bg_bh;
unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
status = ocfs2_claim_clusters(handle, ac,
le16_to_cpu(cl->cl_cpg), &bit_off,
&num_bits);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto bail;
}
/* setup the group */
bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
trace_ocfs2_block_group_alloc_contig(
(unsigned long long)bg_blkno, alloc_rec);
bg_bh = sb_getblk(osb->sb, bg_blkno);
if (!bg_bh) {
status = -EIO;
mlog_errno(status);
goto bail;
}
ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
bg_blkno, num_bits, alloc_rec, cl);
if (status < 0) {
brelse(bg_bh);
mlog_errno(status);
}
bail:
return status ? ERR_PTR(status) : bg_bh;
}
static struct buffer_head *
ocfs2_block_group_alloc_discontig(handle_t *handle,
struct inode *alloc_inode,
struct ocfs2_alloc_context *ac,
struct ocfs2_chain_list *cl)
{
int status;
u32 bit_off, num_bits;
u64 bg_blkno;
unsigned int min_bits = le16_to_cpu(cl->cl_cpg) >> 1;
struct buffer_head *bg_bh = NULL;
unsigned int alloc_rec = ocfs2_find_smallest_chain(cl);
struct ocfs2_super *osb = OCFS2_SB(alloc_inode->i_sb);
if (!ocfs2_supports_discontig_bg(osb)) {
status = -ENOSPC;
goto bail;
}
status = ocfs2_extend_trans(handle,
ocfs2_calc_bg_discontig_credits(osb->sb));
if (status) {
mlog_errno(status);
goto bail;
}
/*
* We're going to be grabbing from multiple cluster groups.
* We don't have enough credits to relink them all, and the
* cluster groups will be staying in cache for the duration of
* this operation.
*/
ac->ac_allow_chain_relink = 0;
/* Claim the first region */
status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits,
&bit_off, &num_bits);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto bail;
}
min_bits = num_bits;
/* setup the group */
bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
trace_ocfs2_block_group_alloc_discontig(
(unsigned long long)bg_blkno, alloc_rec);
bg_bh = sb_getblk(osb->sb, bg_blkno);
if (!bg_bh) {
status = -EIO;
mlog_errno(status);
goto bail;
}
ocfs2_set_new_buffer_uptodate(INODE_CACHE(alloc_inode), bg_bh);
status = ocfs2_block_group_fill(handle, alloc_inode, bg_bh,
bg_blkno, num_bits, alloc_rec, cl);
if (status < 0) {
mlog_errno(status);
goto bail;
}
status = ocfs2_block_group_grow_discontig(handle, alloc_inode,
bg_bh, ac, cl, min_bits);
if (status)
mlog_errno(status);
bail:
if (status)
ocfs2_bg_alloc_cleanup(handle, ac, alloc_inode, bg_bh);
return status ? ERR_PTR(status) : bg_bh;
}
/*
* We expect the block group allocator to already be locked.
*/
static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
struct inode *alloc_inode,
struct buffer_head *bh)
{
int status, credits;
struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
struct ocfs2_chain_list *cl;
struct ocfs2_alloc_context *ac = NULL;
handle_t *handle = NULL;
u32 bit_off, num_bits;
u16 alloc_rec;
u64 bg_blkno;
struct buffer_head *bg_bh = NULL;
struct ocfs2_group_desc *bg;
BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode));
mlog_entry_void();
cl = &fe->id2.i_chain;
status = ocfs2_reserve_clusters(osb,
le16_to_cpu(cl->cl_cpg),
&ac);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto bail;
}
credits = ocfs2_calc_group_alloc_credits(osb->sb,
le16_to_cpu(cl->cl_cpg));
handle = ocfs2_start_trans(osb, credits);
if (IS_ERR(handle)) {
status = PTR_ERR(handle);
handle = NULL;
mlog_errno(status);
goto bail;
}
status = ocfs2_claim_clusters(osb,
handle,
ac,
le16_to_cpu(cl->cl_cpg),
&bit_off,
&num_bits);
if (status < 0) {
if (status != -ENOSPC)
mlog_errno(status);
goto bail;
}
alloc_rec = ocfs2_find_smallest_chain(cl);
/* setup the group */
bg_blkno = ocfs2_clusters_to_blocks(osb->sb, bit_off);
mlog(0, "new descriptor, record %u, at block %llu\n",
alloc_rec, (unsigned long long)bg_blkno);
bg_bh = sb_getblk(osb->sb, bg_blkno);
if (!bg_bh) {
status = -EIO;
mlog_errno(status);
goto bail;
}
ocfs2_set_new_buffer_uptodate(alloc_inode, bg_bh);
status = ocfs2_block_group_fill(handle,
alloc_inode,
bg_bh,
bg_blkno,
alloc_rec,
cl);
if (status < 0) {
mlog_errno(status);
goto bail;
}
bg = (struct ocfs2_group_desc *) bg_bh->b_data;
status = ocfs2_journal_access(handle, alloc_inode,
bh, OCFS2_JOURNAL_ACCESS_WRITE);
if (status < 0) {
mlog_errno(status);
goto bail;
}
le32_add_cpu(&cl->cl_recs[alloc_rec].c_free,
le16_to_cpu(bg->bg_free_bits_count));
le32_add_cpu(&cl->cl_recs[alloc_rec].c_total, le16_to_cpu(bg->bg_bits));
cl->cl_recs[alloc_rec].c_blkno = cpu_to_le64(bg_blkno);
if (le16_to_cpu(cl->cl_next_free_rec) < le16_to_cpu(cl->cl_count))
le16_add_cpu(&cl->cl_next_free_rec, 1);
le32_add_cpu(&fe->id1.bitmap1.i_used, le16_to_cpu(bg->bg_bits) -
le16_to_cpu(bg->bg_free_bits_count));
le32_add_cpu(&fe->id1.bitmap1.i_total, le16_to_cpu(bg->bg_bits));
le32_add_cpu(&fe->i_clusters, le16_to_cpu(cl->cl_cpg));
status = ocfs2_journal_dirty(handle, bh);
if (status < 0) {
mlog_errno(status);
goto bail;
}
spin_lock(&OCFS2_I(alloc_inode)->ip_lock);
OCFS2_I(alloc_inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
fe->i_size = cpu_to_le64(ocfs2_clusters_to_bytes(alloc_inode->i_sb,
le32_to_cpu(fe->i_clusters)));
spin_unlock(&OCFS2_I(alloc_inode)->ip_lock);
i_size_write(alloc_inode, le64_to_cpu(fe->i_size));
alloc_inode->i_blocks = ocfs2_inode_sector_count(alloc_inode);
status = 0;
bail:
if (handle)
ocfs2_commit_trans(osb, handle);
if (ac)
ocfs2_free_alloc_context(ac);
if (bg_bh)
brelse(bg_bh);
mlog_exit(status);
return status;
}
