ocfs2: Modify ocfs2_num_free_extents for future xattr usage.

ocfs2_num_free_extents() is used to find the number of free extent records
in an inode btree. Hence, it takes an "ocfs2_dinode" parameter. We want to
use this for extended attribute trees in the future, so genericize the
interface the take a buffer head. A future patch will allow that buffer_head
to contain any structure rooting an ocfs2 btree.

Signed-off-by: Tao Ma <tao.ma@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>

6 files changed, 15 insertions, 11 deletions

diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 29ff57ec5d1f..377acb24f67b 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -368,12 +368,13 @@ struct ocfs2_merge_ctxt {
  */
 int ocfs2_num_free_extents(struct ocfs2_super *osb,
                            struct inode *inode,
-                           struct ocfs2_dinode *fe)
+                           struct buffer_head *bh)
 {
         int retval;
         struct ocfs2_extent_list *el;
         struct ocfs2_extent_block *eb;
         struct buffer_head *eb_bh = NULL;
+        struct ocfs2_dinode *fe = (struct ocfs2_dinode *)bh->b_data;
 
         mlog_entry_void();
 
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
index 60cd3d59230c..5c0f764b59ec 100644
--- a/fs/ocfs2/alloc.h
+++ b/fs/ocfs2/alloc.h
@@ -47,7 +47,7 @@ int ocfs2_remove_extent(struct inode *inode, struct buffer_head *di_bh,
                         struct ocfs2_cached_dealloc_ctxt *dealloc);
 int ocfs2_num_free_extents(struct ocfs2_super *osb,
                            struct inode *inode,
-                           struct ocfs2_dinode *fe);
+                           struct buffer_head *bh);
 /* how many new metadata chunks would an allocation need at maximum? */
 static inline int ocfs2_extend_meta_needed(struct ocfs2_dinode *fe)
 {
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index a53da1466277..e2008dcec753 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -1712,8 +1712,9 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
                  * ocfs2_lock_allocators(). It greatly over-estimates
                  * the work to be done.
                  */
-                ret = ocfs2_lock_allocators(inode, di, clusters_to_alloc,
-                                            extents_to_split, &data_ac, &meta_ac);
+                ret = ocfs2_lock_allocators(inode, wc->w_di_bh,
+                                            clusters_to_alloc, extents_to_split,
+                                            &data_ac, &meta_ac);
                 if (ret) {
                         mlog_errno(ret);
                         goto out;
diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index 9cce563fd627..fda09c32a5f2 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -1479,7 +1479,8 @@ static int ocfs2_extend_dir(struct ocfs2_super *osb,
         spin_lock(&OCFS2_I(dir)->ip_lock);
         if (dir_i_size == ocfs2_clusters_to_bytes(sb, OCFS2_I(dir)->ip_clusters)) {
                 spin_unlock(&OCFS2_I(dir)->ip_lock);
-                num_free_extents = ocfs2_num_free_extents(osb, dir, fe);
+                num_free_extents = ocfs2_num_free_extents(osb, dir,
+                                                          parent_fe_bh);
                 if (num_free_extents < 0) {
                         status = num_free_extents;
                         mlog_errno(status);
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 1015ef16a8bf..b6c483dfe615 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -521,7 +521,7 @@ int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
         if (mark_unwritten)
                 flags = OCFS2_EXT_UNWRITTEN;
 
-        free_extents = ocfs2_num_free_extents(osb, inode, fe);
+        free_extents = ocfs2_num_free_extents(osb, inode, fe_bh);
         if (free_extents < 0) {
                 status = free_extents;
                 mlog_errno(status);
@@ -609,7 +609,7 @@ leave:
  * File systems which don't support holes call this from
  * ocfs2_extend_allocation().
  */
-int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di,
+int ocfs2_lock_allocators(struct inode *inode, struct buffer_head *di_bh,
                           u32 clusters_to_add, u32 extents_to_split,
                           struct ocfs2_alloc_context **data_ac,
                           struct ocfs2_alloc_context **meta_ac)
@@ -617,6 +617,7 @@ int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di,
         int ret = 0, num_free_extents;
         unsigned int max_recs_needed = clusters_to_add + 2 * extents_to_split;
         struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
 
         *meta_ac = NULL;
         if (data_ac)
@@ -629,7 +630,7 @@ int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di,
              (unsigned long long)OCFS2_I(inode)->ip_blkno, (long long)i_size_read(inode),
              le32_to_cpu(di->i_clusters), clusters_to_add, extents_to_split);
 
-        num_free_extents = ocfs2_num_free_extents(osb, inode, di);
+        num_free_extents = ocfs2_num_free_extents(osb, inode, di_bh);
         if (num_free_extents < 0) {
                 ret = num_free_extents;
                 mlog_errno(ret);
@@ -724,7 +725,7 @@ static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
 restart_all:
         BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
 
-        status = ocfs2_lock_allocators(inode, fe, clusters_to_add, 0, &data_ac,
+        status = ocfs2_lock_allocators(inode, bh, clusters_to_add, 0, &data_ac,
                                        &meta_ac);
         if (status) {
                 mlog_errno(status);
@@ -1395,7 +1396,7 @@ static int __ocfs2_remove_inode_range(struct inode *inode,
         struct ocfs2_alloc_context *meta_ac = NULL;
         struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
 
-        ret = ocfs2_lock_allocators(inode, di, 0, 1, NULL, &meta_ac);
+        ret = ocfs2_lock_allocators(inode, di_bh, 0, 1, NULL, &meta_ac);
         if (ret) {
                 mlog_errno(ret);
                 return ret;
diff --git a/fs/ocfs2/file.h b/fs/ocfs2/file.h
index 5a6d3e48e4ba..c96b8054fbe7 100644
--- a/fs/ocfs2/file.h
+++ b/fs/ocfs2/file.h
@@ -57,7 +57,7 @@ int ocfs2_do_extend_allocation(struct ocfs2_super *osb,
                                enum ocfs2_alloc_restarted *reason_ret);
 int ocfs2_extend_no_holes(struct inode *inode, u64 new_i_size,
                           u64 zero_to);
-int ocfs2_lock_allocators(struct inode *inode, struct ocfs2_dinode *di,
+int ocfs2_lock_allocators(struct inode *inode, struct buffer_head *fe,
                           u32 clusters_to_add, u32 extents_to_split,
                           struct ocfs2_alloc_context **data_ac,
                           struct ocfs2_alloc_context **meta_ac);