jffs2: Remove jffs2_gc_fetch_page and jffs2_gc_release_page

Merge these two helpers into the only callers to get rid of some
amazingly bad calling conventions.

Suggested-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Richard Weinberger <richard@nod.at>

cpukit/libfs/src/jffs2/src/fs-rtems.c

@@ -1316,30 +1316,6 @@ int rtems_jffs2_initialize(
 //
 //==========================================================================
 
-unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, 
-				   struct jffs2_inode_info *f, 
-				   unsigned long offset,
-				   unsigned long *priv)
-{
-	int ret;
-	struct super_block *sb = OFNI_BS_2SFFJ(c);
-	unsigned char *gc_buffer = &sb->s_gc_buffer[0];
-
-	ret = jffs2_read_inode_range(c, f, gc_buffer, 
-				     offset & ~(PAGE_CACHE_SIZE-1), PAGE_CACHE_SIZE);
-	if (ret)
-		return ERR_PTR(ret);
-
-	return gc_buffer;
-}
-
-void jffs2_gc_release_page(struct jffs2_sb_info *c,
-			   unsigned char *ptr,
-			   unsigned long *priv)
-{
-	/* Do nothing */
-}
-
 static struct _inode *new_inode(struct super_block *sb)
 {
 

cpukit/libfs/src/jffs2/src/gc.c

@@ -1173,12 +1173,17 @@ static int jffs2_garbage_collect_dnode(struct jffs2_sb_info *c, struct jffs2_era
 				       struct jffs2_inode_info *f, struct jffs2_full_dnode *fn,
 				       uint32_t start, uint32_t end)
 {
+#ifndef __rtems__
+	struct inode *inode = OFNI_EDONI_2SFFJ(f);
+#endif /* __rtems__ */
 	struct jffs2_full_dnode *new_fn;
 	struct jffs2_raw_inode ri;
 	uint32_t alloclen, offset, orig_end, orig_start;
 	int ret = 0;
 	unsigned char *comprbuf = NULL, *writebuf;
-	unsigned long pg;
+#ifndef __rtems__
+	struct page *page;
+#endif /* __rtems__ */
 	unsigned char *pg_ptr;
 
 	memset(&ri, 0, sizeof(ri));
@@ -1333,15 +1338,26 @@ static int jffs2_garbage_collect_dnode(struct jffs2_sb_info *c, struct jffs2_era
 	 * end up here trying to GC the *same* page that jffs2_write_begin() is
 	 * trying to write out, read_cache_page() will not deadlock. */
 	mutex_unlock(&f->sem);
-	pg_ptr = jffs2_gc_fetch_page(c, f, start, &pg);
+#ifndef __rtems__
-	mutex_lock(&f->sem);
+	page = read_cache_page(inode->i_mapping, start >> PAGE_SHIFT,
-
+			       jffs2_do_readpage_unlock, inode);
-	if (IS_ERR(pg_ptr)) {
+	if (IS_ERR(page)) {
 		pr_warn("read_cache_page() returned error: %ld\n",
-			PTR_ERR(pg_ptr));
+			PTR_ERR(page));
-		return PTR_ERR(pg_ptr);
+		mutex_lock(&f->sem);
+		return PTR_ERR(page);
 	}
 
+	pg_ptr = kmap(page);
+#else /* __rtems__ */
+	pg_ptr = &OFNI_BS_2SFFJ(c)->s_gc_buffer[0];
+	ret = jffs2_read_inode_range(c, f, pg_ptr,
+				     start & ~(PAGE_CACHE_SIZE-1), PAGE_CACHE_SIZE);
+	if (ret)
+		return ret;
+#endif /* __rtems__ */
+	mutex_lock(&f->sem);
+
 	offset = start;
 	while(offset < orig_end) {
 		uint32_t datalen;
@@ -1404,6 +1420,9 @@ static int jffs2_garbage_collect_dnode(struct jffs2_sb_info *c, struct jffs2_era
 		}
 	}
 
-	jffs2_gc_release_page(c, pg_ptr, &pg);
+#ifndef __rtems__
+	kunmap(page);
+	put_page(page);
+#endif /* __rtems__ */
 	return ret;
 }

cpukit/libfs/src/jffs2/src/os-rtems.h

@@ -136,9 +136,6 @@ struct _inode *jffs2_iget(struct super_block *sb, cyg_uint32 ino);
 void jffs2_iput(struct _inode * i);
 void jffs2_gc_release_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f);
 struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, int inum, int nlink);
-unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 
-				   unsigned long offset, unsigned long *priv);
-void jffs2_gc_release_page(struct jffs2_sb_info *c, unsigned char *pg, unsigned long *priv);
 
 /* Avoid polluting RTEMS namespace with names not starting in jffs2_ */
 #define os_to_jffs2_mode(x) jffs2_from_os_mode(x)