[GFS2] Tidy gfs2_unstuffer_page

Tidy up gfs2_unstuffer_page by:

 a) Moving it into bmap.c
 b) Making it static
 c) Calling it directly from gfs2_unstuff_dinode
 d) Updating all callers of gfs2_unstuff_dinode due to one less
    required argument.

It doesn't change the behaviour at all.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

7 files changed, 66 insertions, 77 deletions

diff --git a/fs/gfs2/bmap.c b/fs/gfs2/bmap.c
index 98fa07c2b71..72b19c5d780 100644
--- a/fs/gfs2/bmap.c
+++ b/fs/gfs2/bmap.c
@@ -48,6 +48,65 @@ struct strip_mine {
 };
 
 /**
+ * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page
+ * @ip: the inode
+ * @dibh: the dinode buffer
+ * @block: the block number that was allocated
+ * @private: any locked page held by the caller process
+ *
+ * Returns: errno
+ */
+
+static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
+			       uint64_t block, struct page *page)
+{
+	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+	struct inode *inode = &ip->i_inode;
+	struct buffer_head *bh;
+	int release = 0;
+
+	if (!page || page->index) {
+		page = grab_cache_page(inode->i_mapping, 0);
+		if (!page)
+			return -ENOMEM;
+		release = 1;
+	}
+
+	if (!PageUptodate(page)) {
+		void *kaddr = kmap(page);
+
+		memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode),
+		       ip->i_di.di_size);
+		memset(kaddr + ip->i_di.di_size, 0,
+		       PAGE_CACHE_SIZE - ip->i_di.di_size);
+		kunmap(page);
+
+		SetPageUptodate(page);
+	}
+
+	if (!page_has_buffers(page))
+		create_empty_buffers(page, 1 << inode->i_blkbits,
+				     (1 << BH_Uptodate));
+
+	bh = page_buffers(page);
+
+	if (!buffer_mapped(bh))
+		map_bh(bh, inode->i_sb, block);
+
+	set_buffer_uptodate(bh);
+	if ((sdp->sd_args.ar_data == GFS2_DATA_ORDERED) || gfs2_is_jdata(ip))
+		gfs2_trans_add_bh(ip->i_gl, bh, 0);
+	mark_buffer_dirty(bh);
+
+	if (release) {
+		unlock_page(page);
+		page_cache_release(page);
+	}
+
+	return 0;
+}
+
+/**
  * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
  * @ip: The GFS2 inode to unstuff
  * @unstuffer: the routine that handles unstuffing a non-zero length file
@@ -59,8 +118,7 @@ struct strip_mine {
  * Returns: errno
  */
 
-int gfs2_unstuff_dinode(struct gfs2_inode *ip, gfs2_unstuffer_t unstuffer,
-			void *private)
+int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
 {
 	struct buffer_head *bh, *dibh;
 	uint64_t block = 0;
@@ -90,7 +148,7 @@ int gfs2_unstuff_dinode(struct gfs2_inode *ip, gfs2_unstuffer_t unstuffer,
 		} else {
 			block = gfs2_alloc_data(ip);
 
-			error = unstuffer(ip, dibh, block, private);
+			error = gfs2_unstuffer_page(ip, dibh, block, page);
 			if (error)
 				goto out_brelse;
 		}
@@ -786,8 +844,7 @@ static int do_grow(struct gfs2_inode *ip, uint64_t size)
 
 	if (size > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
 		if (gfs2_is_stuffed(ip)) {
-			error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page,
-						    NULL);
+			error = gfs2_unstuff_dinode(ip, NULL);
 			if (error)
 				goto out_end_trans;
 		}
diff --git a/fs/gfs2/bmap.h b/fs/gfs2/bmap.h
index 06ccb2d808a..1a265412f7e 100644
--- a/fs/gfs2/bmap.h
+++ b/fs/gfs2/bmap.h
@@ -10,12 +10,7 @@
 #ifndef __BMAP_DOT_H__
 #define __BMAP_DOT_H__
 
-typedef int (*gfs2_unstuffer_t) (struct gfs2_inode * ip,
-				 struct buffer_head * dibh, uint64_t block,
-				 void *private);
-int gfs2_unstuff_dinode(struct gfs2_inode *ip, gfs2_unstuffer_t unstuffer,
-			void *private);
-
+int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page);
 int gfs2_block_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, int *boundary);
 int gfs2_extent_map(struct inode *inode, u64 lblock, int *new, u64 *dblock, unsigned *extlen);
 
diff --git a/fs/gfs2/dir.c b/fs/gfs2/dir.c
index f62223b9e53..563b99e419b 100644
--- a/fs/gfs2/dir.c
+++ b/fs/gfs2/dir.c
@@ -173,7 +173,7 @@ static int gfs2_dir_write_data(struct gfs2_inode *ip, const char *buf,
 		return -EINVAL;
 
 	if (gfs2_is_stuffed(ip)) {
-		error = gfs2_unstuff_dinode(ip, NULL, NULL);
+		error = gfs2_unstuff_dinode(ip, NULL);
 		if (error)
 			return error;
 	}
diff --git a/fs/gfs2/ops_address.c b/fs/gfs2/ops_address.c
index d33f6aa7973..93e00a8af8c 100644
--- a/fs/gfs2/ops_address.c
+++ b/fs/gfs2/ops_address.c
@@ -395,8 +395,7 @@ static int gfs2_prepare_write(struct file *file, struct page *page,
 
 	if (gfs2_is_stuffed(ip)) {
 		if (end > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) {
-			error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page,
-						    page);
+			error = gfs2_unstuff_dinode(ip, page);
 			if (error == 0)
 				goto prepare_write;
 		} else if (!PageUptodate(page))
diff --git a/fs/gfs2/ops_vm.c b/fs/gfs2/ops_vm.c
index 08709f19ea9..910722d4c48 100644
--- a/fs/gfs2/ops_vm.c
+++ b/fs/gfs2/ops_vm.c
@@ -104,7 +104,7 @@ static int alloc_page_backing(struct gfs2_inode *ip, struct page *page)
 		goto out_ipres;
 
 	if (gfs2_is_stuffed(ip)) {
-		error = gfs2_unstuff_dinode(ip, gfs2_unstuffer_page, NULL);
+		error = gfs2_unstuff_dinode(ip, NULL);
 		if (error)
 			goto out_trans;
 	}
diff --git a/fs/gfs2/page.c b/fs/gfs2/page.c
index b93caf294b9..0d6befed1ae 100644
--- a/fs/gfs2/page.c
+++ b/fs/gfs2/page.c
@@ -114,66 +114,6 @@ void gfs2_page_sync(struct gfs2_glock *gl, int flags)
 }
 
 /**
- * gfs2_unstuffer_page - unstuff a stuffed inode into a block cached by a page
- * @ip: the inode
- * @dibh: the dinode buffer
- * @block: the block number that was allocated
- * @private: any locked page held by the caller process
- *
- * Returns: errno
- */
-
-int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
-			uint64_t block, void *private)
-{
-	struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
-	struct inode *inode = &ip->i_inode;
-	struct page *page = (struct page *)private;
-	struct buffer_head *bh;
-	int release = 0;
-
-	if (!page || page->index) {
-		page = grab_cache_page(inode->i_mapping, 0);
-		if (!page)
-			return -ENOMEM;
-		release = 1;
-	}
-
-	if (!PageUptodate(page)) {
-		void *kaddr = kmap(page);
-
-		memcpy(kaddr, dibh->b_data + sizeof(struct gfs2_dinode),
-		       ip->i_di.di_size);
-		memset(kaddr + ip->i_di.di_size, 0,
-		       PAGE_CACHE_SIZE - ip->i_di.di_size);
-		kunmap(page);
-
-		SetPageUptodate(page);
-	}
-
-	if (!page_has_buffers(page))
-		create_empty_buffers(page, 1 << inode->i_blkbits,
-				     (1 << BH_Uptodate));
-
-	bh = page_buffers(page);
-
-	if (!buffer_mapped(bh))
-		map_bh(bh, inode->i_sb, block);
-
-	set_buffer_uptodate(bh);
-	if ((sdp->sd_args.ar_data == GFS2_DATA_ORDERED) || gfs2_is_jdata(ip))
-		gfs2_trans_add_bh(ip->i_gl, bh, 0);
-	mark_buffer_dirty(bh);
-
-	if (release) {
-		unlock_page(page);
-		page_cache_release(page);
-	}
-
-	return 0;
-}
-
-/**
  * gfs2_block_truncate_page - Deal with zeroing out data for truncate
  *
  * This is partly borrowed from ext3.
diff --git a/fs/gfs2/page.h b/fs/gfs2/page.h
index 2c853a90ac0..67a4f4b79aa 100644
--- a/fs/gfs2/page.h
+++ b/fs/gfs2/page.h
@@ -14,8 +14,6 @@ void gfs2_pte_inval(struct gfs2_glock *gl);
 void gfs2_page_inval(struct gfs2_glock *gl);
 void gfs2_page_sync(struct gfs2_glock *gl, int flags);
 
-int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
-			uint64_t block, void *private);
 int gfs2_block_truncate_page(struct address_space *mapping);
 void gfs2_page_add_databufs(struct gfs2_inode *ip, struct page *page,
 			    unsigned int from, unsigned int to);