[Ocfs2-tools-devel] [PATCH 4/7] libocfs2: Add ocfs2_grow_chain_allocator()

[Sunil Mushran]

ocfs2_grow_chain_allocator() extends the inode and extent allocators.

Signed-off-by: Sunil Mushran <sunil.mushran at oracle.com>
---
 include/ocfs2/ocfs2.h |    4 ++++
 libocfs2/alloc.c      |   39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+), 0 deletions(-)

diff --git a/include/ocfs2/ocfs2.h b/include/ocfs2/ocfs2.h
index 28fb2b0..e302eb3 100644
--- a/include/ocfs2/ocfs2.h
+++ b/include/ocfs2/ocfs2.h
@@ -679,6 +679,10 @@ errcode_t ocfs2_zero_tail_and_truncate(ocfs2_filesys *fs,
 				       ocfs2_cached_inode *ci,
 				       uint64_t new_size,
 				       uint32_t *new_clusters);
+errcode_t ocfs2_grow_chain_allocator(ocfs2_filesys *fs,
+				     int type,
+				     int slot_num,
+				     uint32_t num_clusters);
 errcode_t ocfs2_new_clusters(ocfs2_filesys *fs,
 			     uint32_t min,
 			     uint32_t requested,
diff --git a/libocfs2/alloc.c b/libocfs2/alloc.c
index 59359a5..2280fbe 100644
--- a/libocfs2/alloc.c
+++ b/libocfs2/alloc.c
@@ -582,6 +582,45 @@ out:
 	return ret;
 }
 
+errcode_t ocfs2_grow_chain_allocator(ocfs2_filesys *fs, int type,
+				     int slot_num, uint32_t num_clusters)
+{
+	errcode_t ret = OCFS2_ET_FILE_NOT_FOUND;
+	ocfs2_cached_inode *ci;
+	int i, num_groups, cpg;
+
+	switch (type) {
+	case EXTENT_ALLOC_SYSTEM_INODE:
+		ci = fs->fs_eb_allocs[slot_num];
+		break;
+	case INODE_ALLOC_SYSTEM_INODE:
+		ci = fs->fs_inode_allocs[slot_num];
+		break;
+	case GLOBAL_INODE_ALLOC_SYSTEM_INODE:
+		ci = fs->fs_system_inode_alloc;
+		break;
+	default:
+		goto out;
+	}
+
+	ret = ocfs2_load_allocator(fs, type, slot_num, &ci);
+	if (ret)
+		goto out;
+
+	cpg = ci->ci_inode->id2.i_chain.cl_cpg;
+
+	num_groups = (num_clusters + cpg - 1) / cpg;
+
+	for (i = 0; i < num_groups; ++i) {
+		ret = ocfs2_chain_add_group(fs, ci);
+		if (ret)
+			goto out;
+	}
+
+out:
+	return ret;
+}
+
 /* XXX what to do about local allocs?
  * XXX Well, we shouldn't use local allocs to allocate, as we are
  *     userspace and we have the entire bitmap in memory.  However, this
-- 
1.6.3.3