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Commit b29e64d8 authored by Gao Xiang's avatar Gao Xiang Committed by Greg Kroah-Hartman
Browse files

staging: erofs: add erofs_allocpage 



This patch introduces an temporary _on-stack_ page
pool to reuse the freed page directly as much as
it can for better performance and release all pages
at a time, it also slightly reduces the possibility of
the potential memory allocation failure.

Signed-off-by: default avatarGao Xiang <gaoxiang25@huawei.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 02827e17

drivers/staging/erofs/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ ccflags-y += -Wall -DEROFS_VERSION=\"$(EROFS_VERSION)\" 
obj-$(CONFIG_EROFS_FS) += erofs.o

# staging requirement: to be self-contained in its own directory

ccflags-y += -I$(src)/include

erofs-objs := super.o inode.o data.o namei.o dir.o

erofs-objs := super.o inode.o data.o namei.o dir.o utils.o

erofs-$(CONFIG_EROFS_FS_XATTR) += xattr.o

erofs-$(CONFIG_EROFS_FS_ZIP) += unzip_vle.o

drivers/staging/erofs/internal.h

+7 −0
Original line number Diff line number Diff line
@@ -369,5 +369,12 @@ static inline void erofs_vunmap(const void *mem, unsigned int count) 
#endif

}



/* utils.c */

extern struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp);



#ifndef lru_to_page

#define lru_to_page(head) (list_entry((head)->prev, struct page, lru))

#endif



#endif

drivers/staging/erofs/utils.c

0 → 100644
+31 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * linux/drivers/staging/erofs/utils.c

 *

 * Copyright (C) 2018 HUAWEI, Inc.

 *             http://www.huawei.com/

 * Created by Gao Xiang <gaoxiang25@huawei.com>

 *

 * This file is subject to the terms and conditions of the GNU General Public

 * License.  See the file COPYING in the main directory of the Linux

 * distribution for more details.

 */



#include "internal.h"



struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp)

{

	struct page *page;



	if (!list_empty(pool)) {

		page = lru_to_page(pool);

		list_del(&page->lru);

	} else {

		page = alloc_pages(gfp | __GFP_NOFAIL, 0);



		BUG_ON(page == NULL);

		BUG_ON(page->mapping != NULL);

	}

	return page;

}