staging: erofs: clean up erofs_map_blocks_iter

This patch cleans up erofs_map_blocks* function and structure family,
just simply the code, no logic change.
Reviewed-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/erofs/data.c

@@ -165,37 +165,16 @@ static int erofs_map_blocks_flatmode(struct inode *inode,
 	return err;
 }
 
-int erofs_map_blocks_iter(struct inode *inode,
-			  struct erofs_map_blocks *map,
-			  struct page **mpage_ret, int flags)
-{
-	/* by default, reading raw data never use erofs_map_blocks_iter */
-	if (unlikely(!is_inode_layout_compression(inode))) {
-		if (*mpage_ret)
-			put_page(*mpage_ret);
-		*mpage_ret = NULL;
-
-		return erofs_map_blocks(inode, map, flags);
-	}
-
-#ifdef CONFIG_EROFS_FS_ZIP
-	return z_erofs_map_blocks_iter(inode, map, mpage_ret, flags);
-#else
-	/* data compression is not available */
-	return -ENOTSUPP;
-#endif
-}
-
 int erofs_map_blocks(struct inode *inode,
 		     struct erofs_map_blocks *map, int flags)
 {
 	if (unlikely(is_inode_layout_compression(inode))) {
-		struct page *mpage = NULL;
-		int err;
+		int err = z_erofs_map_blocks_iter(inode, map, flags);
 
-		err = erofs_map_blocks_iter(inode, map, &mpage, flags);
-		if (mpage)
-			put_page(mpage);
+		if (map->mpage) {
+			put_page(map->mpage);
+			map->mpage = NULL;
+		}
 		return err;
 	}
 	return erofs_map_blocks_flatmode(inode, map, flags);

drivers/staging/erofs/internal.h

@@ -461,11 +461,26 @@ struct erofs_map_blocks {
 	u64 m_plen, m_llen;
 
 	unsigned int m_flags;
+
+	struct page *mpage;
 };
 
 /* Flags used by erofs_map_blocks() */
 #define EROFS_GET_BLOCKS_RAW    0x0001
 
+#ifdef CONFIG_EROFS_FS_ZIP
+int z_erofs_map_blocks_iter(struct inode *inode,
+			    struct erofs_map_blocks *map,
+			    int flags);
+#else
+static inline int z_erofs_map_blocks_iter(struct inode *inode,
+					  struct erofs_map_blocks *map,
+					  int flags)
+{
+	return -ENOTSUPP;
+}
+#endif
+
 /* data.c */
 static inline struct bio *
 erofs_grab_bio(struct super_block *sb,
@@ -522,19 +537,6 @@ static inline struct page *erofs_get_meta_page_nofail(struct super_block *sb,
 }
 
 extern int erofs_map_blocks(struct inode *, struct erofs_map_blocks *, int);
-extern int erofs_map_blocks_iter(struct inode *, struct erofs_map_blocks *,
-	struct page **, int);
-
-struct erofs_map_blocks_iter {
-	struct erofs_map_blocks map;
-	struct page *mpage;
-};
-
-#ifdef CONFIG_EROFS_FS_ZIP
-extern int z_erofs_map_blocks_iter(struct inode *,
-				   struct erofs_map_blocks *,
-				   struct page **, int);
-#endif
 
 static inline struct page *
 erofs_get_inline_page(struct inode *inode,

drivers/staging/erofs/unzip_vle.c

@@ -636,7 +636,7 @@ struct z_erofs_vle_frontend {
 	struct inode *const inode;
 
 	struct z_erofs_vle_work_builder builder;
-	struct erofs_map_blocks_iter m_iter;
+	struct erofs_map_blocks map;
 
 	z_erofs_vle_owned_workgrp_t owned_head;
 
@@ -647,8 +647,9 @@ struct z_erofs_vle_frontend {
 
 #define VLE_FRONTEND_INIT(__i) { \
 	.inode = __i, \
-	.m_iter = { \
-		{ .m_llen = 0, .m_plen = 0 }, \
+	.map = { \
+		.m_llen = 0, \
+		.m_plen = 0, \
 		.mpage = NULL \
 	}, \
 	.builder = VLE_WORK_BUILDER_INIT(), \
@@ -681,8 +682,7 @@ static int z_erofs_do_read_page(struct z_erofs_vle_frontend *fe,
 {
 	struct super_block *const sb = fe->inode->i_sb;
 	struct erofs_sb_info *const sbi __maybe_unused = EROFS_SB(sb);
-	struct erofs_map_blocks_iter *const m = &fe->m_iter;
-	struct erofs_map_blocks *const map = &m->map;
+	struct erofs_map_blocks *const map = &fe->map;
 	struct z_erofs_vle_work_builder *const builder = &fe->builder;
 	const loff_t offset = page_offset(page);
 
@@ -715,7 +715,7 @@ static int z_erofs_do_read_page(struct z_erofs_vle_frontend *fe,
 
 	map->m_la = offset + cur;
 	map->m_llen = 0;
-	err = erofs_map_blocks_iter(fe->inode, map, &m->mpage, 0);
+	err = z_erofs_map_blocks_iter(fe->inode, map, 0);
 	if (unlikely(err))
 		goto err_out;
 
@@ -1484,8 +1484,8 @@ static int z_erofs_vle_normalaccess_readpage(struct file *file,
 
 	z_erofs_submit_and_unzip(&f, &pagepool, true);
 out:
-	if (f.m_iter.mpage)
-		put_page(f.m_iter.mpage);
+	if (f.map.mpage)
+		put_page(f.map.mpage);
 
 	/* clean up the remaining free pages */
 	put_pages_list(&pagepool);
@@ -1555,8 +1555,8 @@ static int z_erofs_vle_normalaccess_readpages(struct file *filp,
 
 	z_erofs_submit_and_unzip(&f, &pagepool, sync);
 
-	if (f.m_iter.mpage)
-		put_page(f.m_iter.mpage);
+	if (f.map.mpage)
+		put_page(f.map.mpage);
 
 	/* clean up the remaining free pages */
 	put_pages_list(&pagepool);
@@ -1701,14 +1701,14 @@ vle_get_logical_extent_head(const struct vle_map_blocks_iter_ctx *ctx,
 
 int z_erofs_map_blocks_iter(struct inode *inode,
 	struct erofs_map_blocks *map,
-	struct page **mpage_ret, int flags)
+	int flags)
 {
 	void *kaddr;
 	const struct vle_map_blocks_iter_ctx ctx = {
 		.inode = inode,
 		.sb = inode->i_sb,
 		.clusterbits = EROFS_I_SB(inode)->clusterbits,
-		.mpage_ret = mpage_ret,
+		.mpage_ret = &map->mpage,
 		.kaddr_ret = &kaddr
 	};
 	const unsigned int clustersize = 1 << ctx.clusterbits;
@@ -1722,7 +1722,7 @@ int z_erofs_map_blocks_iter(struct inode *inode,
 
 	/* initialize `pblk' to keep gcc from printing foolish warnings */
 	erofs_blk_t mblk, pblk = 0;
-	struct page *mpage = *mpage_ret;
+	struct page *mpage = map->mpage;
 	struct z_erofs_vle_decompressed_index *di;
 	unsigned int cluster_type, logical_cluster_ofs;
 	int err = 0;
@@ -1758,7 +1758,7 @@ int z_erofs_map_blocks_iter(struct inode *inode,
 			err = PTR_ERR(mpage);
 			goto out;
 		}
-		*mpage_ret = mpage;
+		map->mpage = mpage;
 	} else {
 		lock_page(mpage);
 		DBG_BUGON(!PageUptodate(mpage));
@@ -1818,7 +1818,7 @@ int z_erofs_map_blocks_iter(struct inode *inode,
 		/* get the correspoinding first chunk */
 		err = vle_get_logical_extent_head(&ctx, lcn, &ofs,
 						  &pblk, &map->m_flags);
-		mpage = *mpage_ret;
+		mpage = map->mpage;
 
 		if (unlikely(err)) {
 			if (mpage)