btrfs: convert lzo_decompress() to take a folio

The old page API is being gradually replaced and converted to use folio
to improve code readability and avoid repeated conversion between page
and folio. And memcpy_to_page() can be replaced with memcpy_to_folio().
But there is no memzero_folio(), but it can be replaced equivalently by
folio_zero_range().

Signed-off-by: Li Zetao <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: Li Zetao

fs/btrfs/compression.c

@@ -144,7 +144,7 @@ static int compression_decompress(int type, struct list_head *ws,
 	switch (type) {
 	case BTRFS_COMPRESS_ZLIB: return zlib_decompress(ws, data_in, page_folio(dest_page),
 						dest_pgoff, srclen, destlen);
-	case BTRFS_COMPRESS_LZO:  return lzo_decompress(ws, data_in, dest_page,
+	case BTRFS_COMPRESS_LZO:  return lzo_decompress(ws, data_in, page_folio(dest_page),
 						dest_pgoff, srclen, destlen);
 	case BTRFS_COMPRESS_ZSTD: return zstd_decompress(ws, data_in, dest_page,
 						dest_pgoff, srclen, destlen);

fs/btrfs/compression.h

@@ -173,7 +173,7 @@ int lzo_compress_folios(struct list_head *ws, struct address_space *mapping,
 		unsigned long *total_in, unsigned long *total_out);
 int lzo_decompress_bio(struct list_head *ws, struct compressed_bio *cb);
 int lzo_decompress(struct list_head *ws, const u8 *data_in,
-		struct page *dest_page, unsigned long dest_pgoff, size_t srclen,
+		struct folio *dest_folio, unsigned long dest_pgoff, size_t srclen,
 		size_t destlen);
 struct list_head *lzo_alloc_workspace(unsigned int level);
 void lzo_free_workspace(struct list_head *ws);

fs/btrfs/lzo.c

@@ -438,11 +438,11 @@ int lzo_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
 }
 
 int lzo_decompress(struct list_head *ws, const u8 *data_in,
-		struct page *dest_page, unsigned long dest_pgoff, size_t srclen,
+		struct folio *dest_folio, unsigned long dest_pgoff, size_t srclen,
 		size_t destlen)
 {
 	struct workspace *workspace = list_entry(ws, struct workspace, list);
-	struct btrfs_fs_info *fs_info = page_to_fs_info(dest_page);
+	struct btrfs_fs_info *fs_info = folio_to_fs_info(dest_folio);
 	const u32 sectorsize = fs_info->sectorsize;
 	size_t in_len;
 	size_t out_len;
@@ -467,22 +467,22 @@ int lzo_decompress(struct list_head *ws, const u8 *data_in,
 	out_len = sectorsize;
 	ret = lzo1x_decompress_safe(data_in, in_len, workspace->buf, &out_len);
 	if (unlikely(ret != LZO_E_OK)) {
-		struct btrfs_inode *inode = BTRFS_I(dest_page->mapping->host);
+		struct btrfs_inode *inode = folio_to_inode(dest_folio);
 
 		btrfs_err(fs_info,
 		"lzo decompression failed, error %d root %llu inode %llu offset %llu",
 			  ret, btrfs_root_id(inode->root), btrfs_ino(inode),
-			  page_offset(dest_page));
+			  folio_pos(dest_folio));
 		ret = -EIO;
 		goto out;
 	}
 
 	ASSERT(out_len <= sectorsize);
-	memcpy_to_page(dest_page, dest_pgoff, workspace->buf, out_len);
+	memcpy_to_folio(dest_folio, dest_pgoff, workspace->buf, out_len);
 	/* Early end, considered as an error. */
 	if (unlikely(out_len < destlen)) {
 		ret = -EIO;
-		memzero_page(dest_page, dest_pgoff + out_len, destlen - out_len);
+		folio_zero_range(dest_folio, dest_pgoff + out_len, destlen - out_len);
 	}
 out:
 	return ret;