Ocfs2/refcounttree: Publicize couple of funcs from refcounttree.c

The original goal of commonizing these funcs is to benefit defraging/extent_moving
codes in the future,  based on the fact that reflink and defragmentation having
the same Copy-On-Wrtie mechanism.

Signed-off-by: Tristan Ye <tristan.ye@oracle.com>

2 files changed, 40 insertions, 29 deletions

diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index 3c7606cff1a..ebfd3825f12 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -66,7 +66,7 @@ struct ocfs2_cow_context {
                             u32 *num_clusters,
                             unsigned int *extent_flags);
         int (*cow_duplicate_clusters)(handle_t *handle,
-                                      struct ocfs2_cow_context *context,
+                                      struct file *file,
                                       u32 cpos, u32 old_cluster,
                                       u32 new_cluster, u32 new_len);
 };
@@ -2921,20 +2921,21 @@ static int ocfs2_clear_cow_buffer(handle_t *handle, struct buffer_head *bh)
         return 0;
 }
 
-static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
-                                            struct ocfs2_cow_context *context,
-                                            u32 cpos, u32 old_cluster,
-                                            u32 new_cluster, u32 new_len)
+int ocfs2_duplicate_clusters_by_page(handle_t *handle,
+                                     struct file *file,
+                                     u32 cpos, u32 old_cluster,
+                                     u32 new_cluster, u32 new_len)
 {
         int ret = 0, partial;
-        struct ocfs2_caching_info *ci = context->data_et.et_ci;
+        struct inode *inode = file->f_path.dentry->d_inode;
+        struct ocfs2_caching_info *ci = INODE_CACHE(inode);
         struct super_block *sb = ocfs2_metadata_cache_get_super(ci);
         u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
         struct page *page;
         pgoff_t page_index;
         unsigned int from, to, readahead_pages;
         loff_t offset, end, map_end;
-        struct address_space *mapping = context->inode->i_mapping;
+        struct address_space *mapping = inode->i_mapping;
 
         trace_ocfs2_duplicate_clusters_by_page(cpos, old_cluster,
                                                new_cluster, new_len);
@@ -2948,8 +2949,8 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
          * We only duplicate pages until we reach the page contains i_size - 1.
          * So trim 'end' to i_size.
          */
-        if (end > i_size_read(context->inode))
-                end = i_size_read(context->inode);
+        if (end > i_size_read(inode))
+                end = i_size_read(inode);
 
         while (offset < end) {
                 page_index = offset >> PAGE_CACHE_SHIFT;
@@ -2972,10 +2973,9 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
                 if (PAGE_CACHE_SIZE <= OCFS2_SB(sb)->s_clustersize)
                         BUG_ON(PageDirty(page));
 
-                if (PageReadahead(page) && context->file) {
+                if (PageReadahead(page)) {
                         page_cache_async_readahead(mapping,
-                                                   &context->file->f_ra,
-                                                   context->file,
+                                                   &file->f_ra, file,
                                                    page, page_index,
                                                    readahead_pages);
                 }
@@ -2999,8 +2999,7 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
                         }
                 }
 
-                ocfs2_map_and_dirty_page(context->inode,
-                                         handle, from, to,
+                ocfs2_map_and_dirty_page(inode, handle, from, to,
                                          page, 0, &new_block);
                 mark_page_accessed(page);
 unlock:
@@ -3015,14 +3014,15 @@ unlock:
         return ret;
 }
 
-static int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
-                                           struct ocfs2_cow_context *context,
-                                           u32 cpos, u32 old_cluster,
-                                           u32 new_cluster, u32 new_len)
+int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
+                                    struct file *file,
+                                    u32 cpos, u32 old_cluster,
+                                    u32 new_cluster, u32 new_len)
 {
         int ret = 0;
-        struct super_block *sb = context->inode->i_sb;
-        struct ocfs2_caching_info *ci = context->data_et.et_ci;
+        struct inode *inode = file->f_path.dentry->d_inode;
+        struct super_block *sb = inode->i_sb;
+        struct ocfs2_caching_info *ci = INODE_CACHE(inode);
         int i, blocks = ocfs2_clusters_to_blocks(sb, new_len);
         u64 old_block = ocfs2_clusters_to_blocks(sb, old_cluster);
         u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
@@ -3145,8 +3145,8 @@ static int ocfs2_replace_clusters(handle_t *handle,
 
         /*If the old clusters is unwritten, no need to duplicate. */
         if (!(ext_flags & OCFS2_EXT_UNWRITTEN)) {
-                ret = context->cow_duplicate_clusters(handle, context, cpos,
-                                                      old, new, len);
+                ret = context->cow_duplicate_clusters(handle, context->file,
+                                                      cpos, old, new, len);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
@@ -3162,22 +3162,22 @@ out:
         return ret;
 }
 
-static int ocfs2_cow_sync_writeback(struct super_block *sb,
-                                    struct ocfs2_cow_context *context,
-                                    u32 cpos, u32 num_clusters)
+int ocfs2_cow_sync_writeback(struct super_block *sb,
+                             struct inode *inode,
+                             u32 cpos, u32 num_clusters)
 {
         int ret = 0;
         loff_t offset, end, map_end;
         pgoff_t page_index;
         struct page *page;
 
-        if (ocfs2_should_order_data(context->inode))
+        if (ocfs2_should_order_data(inode))
                 return 0;
 
         offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
         end = offset + (num_clusters << OCFS2_SB(sb)->s_clustersize_bits);
 
-        ret = filemap_fdatawrite_range(context->inode->i_mapping,
+        ret = filemap_fdatawrite_range(inode->i_mapping,
                                        offset, end - 1);
         if (ret < 0) {
                 mlog_errno(ret);
@@ -3190,7 +3190,7 @@ static int ocfs2_cow_sync_writeback(struct super_block *sb,
                 if (map_end > end)
                         map_end = end;
 
-                page = find_or_create_page(context->inode->i_mapping,
+                page = find_or_create_page(inode->i_mapping,
                                            page_index, GFP_NOFS);
                 BUG_ON(!page);
 
@@ -3349,7 +3349,7 @@ static int ocfs2_make_clusters_writable(struct super_block *sb,
          * in write-back mode.
          */
         if (context->get_clusters == ocfs2_di_get_clusters) {
-                ret = ocfs2_cow_sync_writeback(sb, context, cpos,
+                ret = ocfs2_cow_sync_writeback(sb, context->inode, cpos,
                                                orig_num_clusters);
                 if (ret)
                         mlog_errno(ret);
diff --git a/fs/ocfs2/refcounttree.h b/fs/ocfs2/refcounttree.h
index c8ce46f7d8e..7754608c83a 100644
--- a/fs/ocfs2/refcounttree.h
+++ b/fs/ocfs2/refcounttree.h
@@ -84,6 +84,17 @@ int ocfs2_refcount_cow_xattr(struct inode *inode,
                              struct buffer_head *ref_root_bh,
                              u32 cpos, u32 write_len,
                              struct ocfs2_post_refcount *post);
+int ocfs2_duplicate_clusters_by_page(handle_t *handle,
+                                     struct file *file,
+                                     u32 cpos, u32 old_cluster,
+                                     u32 new_cluster, u32 new_len);
+int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
+                                    struct file *file,
+                                    u32 cpos, u32 old_cluster,
+                                    u32 new_cluster, u32 new_len);
+int ocfs2_cow_sync_writeback(struct super_block *sb,
+                             struct inode *inode,
+                             u32 cpos, u32 num_clusters);
 int ocfs2_add_refcount_flag(struct inode *inode,
                             struct ocfs2_extent_tree *data_et,
                             struct ocfs2_caching_info *ref_ci,