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Message-ID: <20190729065159.62378-13-gaoxiang25@huawei.com>
Date: Mon, 29 Jul 2019 14:51:49 +0800
From: Gao Xiang <gaoxiang25@...wei.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
<devel@...verdev.osuosl.org>
CC: LKML <linux-kernel@...r.kernel.org>,
<linux-erofs@...ts.ozlabs.org>, "Chao Yu" <chao@...nel.org>,
Miao Xie <miaoxie@...wei.com>, <weidu.du@...wei.com>,
Fang Wei <fangwei1@...wei.com>,
Gao Xiang <gaoxiang25@...wei.com>
Subject: [PATCH 12/22] staging: erofs: refine erofs_allocpage()
remove duplicated code in decompressor by introducing
failable erofs_allocpage().
Signed-off-by: Gao Xiang <gaoxiang25@...wei.com>
---
drivers/staging/erofs/decompressor.c | 12 +++---------
drivers/staging/erofs/internal.h | 2 +-
drivers/staging/erofs/utils.c | 5 +++--
drivers/staging/erofs/zdata.c | 2 +-
4 files changed, 8 insertions(+), 13 deletions(-)
diff --git a/drivers/staging/erofs/decompressor.c b/drivers/staging/erofs/decompressor.c
index ee5762351f80..744c43a456e9 100644
--- a/drivers/staging/erofs/decompressor.c
+++ b/drivers/staging/erofs/decompressor.c
@@ -74,15 +74,9 @@ static int lz4_prepare_destpages(struct z_erofs_decompress_req *rq,
victim = availables[--top];
get_page(victim);
} else {
- if (!list_empty(pagepool)) {
- victim = lru_to_page(pagepool);
- list_del(&victim->lru);
- DBG_BUGON(page_ref_count(victim) != 1);
- } else {
- victim = alloc_pages(GFP_KERNEL, 0);
- if (!victim)
- return -ENOMEM;
- }
+ victim = erofs_allocpage(pagepool, GFP_KERNEL, false);
+ if (unlikely(!victim))
+ return -ENOMEM;
victim->mapping = Z_EROFS_MAPPING_STAGING;
}
rq->out[i] = victim;
diff --git a/drivers/staging/erofs/internal.h b/drivers/staging/erofs/internal.h
index b206a85776b4..e35c7d8f75d2 100644
--- a/drivers/staging/erofs/internal.h
+++ b/drivers/staging/erofs/internal.h
@@ -517,7 +517,7 @@ int erofs_namei(struct inode *dir, struct qstr *name,
extern const struct file_operations erofs_dir_fops;
/* utils.c / zdata.c */
-struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp);
+struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp, bool nofail);
#if (EROFS_PCPUBUF_NR_PAGES > 0)
void *erofs_get_pcpubuf(unsigned int pagenr);
diff --git a/drivers/staging/erofs/utils.c b/drivers/staging/erofs/utils.c
index 0e86e44d60d0..260ea2970b4b 100644
--- a/drivers/staging/erofs/utils.c
+++ b/drivers/staging/erofs/utils.c
@@ -9,15 +9,16 @@
#include "internal.h"
#include <linux/pagevec.h>
-struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp)
+struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp, bool nofail)
{
struct page *page;
if (!list_empty(pool)) {
page = lru_to_page(pool);
+ DBG_BUGON(page_ref_count(page) != 1);
list_del(&page->lru);
} else {
- page = alloc_pages(gfp | __GFP_NOFAIL, 0);
+ page = alloc_pages(gfp | (nofail ? __GFP_NOFAIL : 0), 0);
}
return page;
}
diff --git a/drivers/staging/erofs/zdata.c b/drivers/staging/erofs/zdata.c
index bc478eebf509..02560b940558 100644
--- a/drivers/staging/erofs/zdata.c
+++ b/drivers/staging/erofs/zdata.c
@@ -634,7 +634,7 @@ z_erofs_vle_work_iter_end(struct z_erofs_vle_work_builder *builder)
static inline struct page *__stagingpage_alloc(struct list_head *pagepool,
gfp_t gfp)
{
- struct page *page = erofs_allocpage(pagepool, gfp);
+ struct page *page = erofs_allocpage(pagepool, gfp, true);
if (unlikely(!page))
return NULL;
--
2.17.1
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