ocfs2: Grow discontig block groups in one transaction.

Rather than extending the transaction every time we add an extent to a
discontiguous block group, we grab enough credits to fill the extent
list up front.  This means we can free the bits in the same transaction
if we end up not getting enough space.

Signed-off-by: Joel Becker <joel.becker@oracle.com>

1 files changed, 22 insertions, 26 deletions

diff --git a/fs/ocfs2/suballoc.c b/fs/ocfs2/suballoc.c
index 7809f41bcbfc..e5403acdb3f5 100644
--- a/fs/ocfs2/suballoc.c
+++ b/fs/ocfs2/suballoc.c
@@ -523,12 +523,6 @@ static int ocfs2_block_group_grow_discontig(handle_t *handle,
 
         while ((needed > 0) && (le16_to_cpu(el->l_next_free_rec) <
                                 le16_to_cpu(el->l_count))) {
-                status = ocfs2_extend_trans(handle, OCFS2_SUBALLOC_ALLOC);
-                if (status) {
-                        mlog_errno(status);
-                        goto bail;
-                }
-
                 if (min_bits > needed)
                         min_bits = needed;
                 status = ocfs2_block_group_claim_bits(osb, handle, ac,
@@ -556,11 +550,12 @@ bail:
         return status;
 }
 
-static void ocfs2_bg_alloc_cleanup(struct inode *alloc_inode,
-                                   struct buffer_head *bg_bh,
-                                   struct ocfs2_cached_dealloc_ctxt *dealloc)
+static void ocfs2_bg_alloc_cleanup(handle_t *handle,
+                                   struct ocfs2_alloc_context *cluster_ac,
+                                   struct inode *alloc_inode,
+                                   struct buffer_head *bg_bh)
 {
-        int i;
+        int i, ret;
         struct ocfs2_group_desc *bg;
         struct ocfs2_extent_list *el;
         struct ocfs2_extent_rec *rec;
@@ -572,9 +567,13 @@ static void ocfs2_bg_alloc_cleanup(struct inode *alloc_inode,
         el = &bg->bg_list;
         for (i = 0; i < le16_to_cpu(el->l_next_free_rec); i++) {
                 rec = &el->l_recs[i];
-                ocfs2_cache_cluster_dealloc(dealloc,
-                                            le64_to_cpu(rec->e_blkno),
-                                            le32_to_cpu(rec->e_leaf_clusters));
+                ret = ocfs2_free_clusters(handle, cluster_ac->ac_inode,
+                                          cluster_ac->ac_bh,
+                                          le64_to_cpu(rec->e_blkno),
+                                          le32_to_cpu(rec->e_leaf_clusters));
+                if (ret)
+                        mlog_errno(ret);
+                /* Try all the clusters to free */
         }
 
         ocfs2_remove_from_cache(INODE_CACHE(alloc_inode), bg_bh);
@@ -585,8 +584,7 @@ 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,
-                                  struct ocfs2_cached_dealloc_ctxt *dealloc)
+                                  struct ocfs2_chain_list *cl)
 {
         int status;
         u32 bit_off, num_bits;
@@ -601,6 +599,13 @@ ocfs2_block_group_alloc_discontig(handle_t *handle,
                 goto bail;
         }
 
+        status = ocfs2_extend_trans(handle,
+                                    ocfs2_calc_bg_discontig_credits(osb->sb));
+        if (status) {
+                mlog_errno(status);
+                goto bail;
+        }
+
         /* Claim the first region */
         status = ocfs2_block_group_claim_bits(osb, handle, ac, min_bits,
                                               &bit_off, &num_bits);
@@ -638,7 +643,7 @@ ocfs2_block_group_alloc_discontig(handle_t *handle,
 
 bail:
         if (status)
-                ocfs2_bg_alloc_cleanup(alloc_inode, bg_bh, dealloc);
+                ocfs2_bg_alloc_cleanup(handle, ac, alloc_inode, bg_bh);
         return status ? ERR_PTR(status) : bg_bh;
 }
 
@@ -660,14 +665,11 @@ static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
         u64 bg_blkno;
         struct buffer_head *bg_bh = NULL;
         struct ocfs2_group_desc *bg;
-        struct ocfs2_cached_dealloc_ctxt dealloc;
 
         BUG_ON(ocfs2_is_cluster_bitmap(alloc_inode));
 
         mlog_entry_void();
 
-        ocfs2_init_dealloc_ctxt(&dealloc);
-
         cl = &fe->id2.i_chain;
         status = ocfs2_reserve_clusters_with_limit(osb,
                                                    le16_to_cpu(cl->cl_cpg),
@@ -699,8 +701,7 @@ static int ocfs2_block_group_alloc(struct ocfs2_super *osb,
         if (IS_ERR(bg_bh) && (PTR_ERR(bg_bh) == -ENOSPC))
                 bg_bh = ocfs2_block_group_alloc_discontig(handle,
                                                           alloc_inode,
-                                                          ac, cl,
-                                                          &dealloc);
+                                                          ac, cl);
         if (IS_ERR(bg_bh)) {
                 status = PTR_ERR(bg_bh);
                 bg_bh = NULL;
@@ -750,11 +751,6 @@ bail:
         if (handle)
                 ocfs2_commit_trans(osb, handle);
 
-        if (ocfs2_dealloc_has_cluster(&dealloc)) {
-                ocfs2_schedule_truncate_log_flush(osb, 1);
-                ocfs2_run_deallocs(osb, &dealloc);
-        }
-
         if (ac)
                 ocfs2_free_alloc_context(ac);