gfs2: Clean up gfs2_unstuff_dinode

Split __gfs2_unstuff_inode off from gfs2_unstuff_dinode and clean up the
code a little.  All remaining callers now pass NULL as the page argument
of gfs2_unstuff_dinode, so remove that argument.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

Author: Andreas Gruenbacher

fs/gfs2/bmap.c

@@ -56,14 +56,6 @@ static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
 			       u64 block, struct page *page)
 {
 	struct inode *inode = &ip->i_inode;
-	int release = 0;
-
-	if (!page || page->index) {
-		page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
-		if (!page)
-			return -ENOMEM;
-		release = 1;
-	}
 
 	if (!PageUptodate(page)) {
 		void *kaddr = kmap(page);
@@ -97,38 +89,20 @@ static int gfs2_unstuffer_page(struct gfs2_inode *ip, struct buffer_head *dibh,
 		gfs2_ordered_add_inode(ip);
 	}
 
-	if (release) {
-		unlock_page(page);
-		put_page(page);
-	}
-
 	return 0;
 }
 
-/**
- * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
- * @ip: The GFS2 inode to unstuff
- * @page: The (optional) page. This is looked up if the @page is NULL
- *
- * This routine unstuffs a dinode and returns it to a "normal" state such
- * that the height can be grown in the traditional way.
- *
- * Returns: errno
- */
-
-int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
+static int __gfs2_unstuff_inode(struct gfs2_inode *ip, struct page *page)
 {
 	struct buffer_head *bh, *dibh;
 	struct gfs2_dinode *di;
 	u64 block = 0;
 	int isdir = gfs2_is_dir(ip);
 	int error;
 
-	down_write(&ip->i_rw_mutex);
-
 	error = gfs2_meta_inode_buffer(ip, &dibh);
 	if (error)
-		goto out;
+		return error;
 
 	if (i_size_read(&ip->i_inode)) {
 		/* Get a free block, fill it with the stuffed data,
@@ -170,12 +144,38 @@ int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page)
 
 out_brelse:
 	brelse(dibh);
+	return error;
+}
+
+/**
+ * gfs2_unstuff_dinode - Unstuff a dinode when the data has grown too big
+ * @ip: The GFS2 inode to unstuff
+ *
+ * This routine unstuffs a dinode and returns it to a "normal" state such
+ * that the height can be grown in the traditional way.
+ *
+ * Returns: errno
+ */
+
+int gfs2_unstuff_dinode(struct gfs2_inode *ip)
+{
+	struct inode *inode = &ip->i_inode;
+	struct page *page;
+	int error;
+
+	down_write(&ip->i_rw_mutex);
+	page = find_or_create_page(inode->i_mapping, 0, GFP_NOFS);
+	error = -ENOMEM;
+	if (!page)
+		goto out;
+	error = __gfs2_unstuff_inode(ip, page);
+	unlock_page(page);
+	put_page(page);
 out:
 	up_write(&ip->i_rw_mutex);
 	return error;
 }
 
-
 /**
  * find_metapath - Find path through the metadata tree
  * @sdp: The superblock
@@ -1079,7 +1079,7 @@ static int gfs2_iomap_begin_write(struct inode *inode, loff_t pos,
 			goto out_trans_fail;
 
 		if (unstuff) {
-			ret = gfs2_unstuff_dinode(ip, NULL);
+			ret = gfs2_unstuff_dinode(ip);
 			if (ret)
 				goto out_trans_end;
 			release_metapath(mp);
@@ -2143,7 +2143,7 @@ static int do_grow(struct inode *inode, u64 size)
 		goto do_grow_release;
 
 	if (unstuff) {
-		error = gfs2_unstuff_dinode(ip, NULL);
+		error = gfs2_unstuff_dinode(ip);
 		if (error)
 			goto do_end_trans;
 	}

fs/gfs2/bmap.h

@@ -46,7 +46,7 @@ static inline void gfs2_write_calc_reserv(const struct gfs2_inode *ip,
 extern const struct iomap_ops gfs2_iomap_ops;
 extern const struct iomap_writeback_ops gfs2_writeback_ops;
 
-extern int gfs2_unstuff_dinode(struct gfs2_inode *ip, struct page *page);
+extern int gfs2_unstuff_dinode(struct gfs2_inode *ip);
 extern int gfs2_block_map(struct inode *inode, sector_t lblock,
 			  struct buffer_head *bh, int create);
 extern int gfs2_iomap_get(struct inode *inode, loff_t pos, loff_t length,

fs/gfs2/dir.c

@@ -172,7 +172,7 @@ 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);
+		error = gfs2_unstuff_dinode(ip);
 		if (error)
 			return error;
 	}

fs/gfs2/file.c

@@ -512,7 +512,7 @@ static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
 
 	/* Unstuff, if required, and allocate backing blocks for page */
 	if (gfs2_is_stuffed(ip)) {
-		err = gfs2_unstuff_dinode(ip, NULL);
+		err = gfs2_unstuff_dinode(ip);
 		if (err) {
 			ret = block_page_mkwrite_return(err);
 			goto out_trans_end;
@@ -981,7 +981,7 @@ static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
 	gfs2_trans_add_meta(ip->i_gl, dibh);
 
 	if (gfs2_is_stuffed(ip)) {
-		error = gfs2_unstuff_dinode(ip, NULL);
+		error = gfs2_unstuff_dinode(ip);
 		if (unlikely(error))
 			goto out;
 	}

fs/gfs2/quota.c

@@ -825,7 +825,7 @@ static int gfs2_adjust_quota(struct gfs2_inode *ip, loff_t loc,
 	u64 size;
 
 	if (gfs2_is_stuffed(ip)) {
-		err = gfs2_unstuff_dinode(ip, NULL);
+		err = gfs2_unstuff_dinode(ip);
 		if (err)
 			return err;
 	}