From: Gao Xiang <hsiangkao@aol.com>
To: Chao Yu <yuchao0@huawei.com>, linux-erofs@lists.ozlabs.org
Cc: Miao Xie <miaoxie@huawei.com>,
LKML <linux-kernel@vger.kernel.org>,
Gao Xiang <gaoxiang25@huawei.com>
Subject: [PATCH v2] erofs: get rid of __stagingpage_alloc helper
Date: Sun, 24 Nov 2019 10:52:17 +0800 [thread overview]
Message-ID: <20191124025217.12345-1-hsiangkao@aol.com> (raw)
In-Reply-To: 20191124025217.12345-1-hsiangkao.ref@aol.com
From: Gao Xiang <gaoxiang25@huawei.com>
Now open code is much cleaner due to iterative development.
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
---
changes since v1:
- drop redundant nofail in erofs_allocpage since it has gfp;
- add to managed cache then visible to pcluster;
- stress testing survival for days on products
without unexpected behavior.
fs/erofs/decompressor.c | 2 +-
fs/erofs/internal.h | 2 +-
fs/erofs/utils.c | 4 ++--
fs/erofs/zdata.c | 37 +++++++++++++++++--------------------
4 files changed, 21 insertions(+), 24 deletions(-)
diff --git a/fs/erofs/decompressor.c b/fs/erofs/decompressor.c
index 19f89f9fb10c..2890a67a1ded 100644
--- a/fs/erofs/decompressor.c
+++ b/fs/erofs/decompressor.c
@@ -73,7 +73,7 @@ static int z_erofs_lz4_prepare_destpages(struct z_erofs_decompress_req *rq,
victim = availables[--top];
get_page(victim);
} else {
- victim = erofs_allocpage(pagepool, GFP_KERNEL, false);
+ victim = erofs_allocpage(pagepool, GFP_KERNEL);
if (!victim)
return -ENOMEM;
victim->mapping = Z_EROFS_MAPPING_STAGING;
diff --git a/fs/erofs/internal.h b/fs/erofs/internal.h
index 544a453f3076..0c1175a08e54 100644
--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -382,7 +382,7 @@ 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, bool nofail);
+struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp);
#if (EROFS_PCPUBUF_NR_PAGES > 0)
void *erofs_get_pcpubuf(unsigned int pagenr);
diff --git a/fs/erofs/utils.c b/fs/erofs/utils.c
index f66043ee16b9..1e8e1450d5b0 100644
--- a/fs/erofs/utils.c
+++ b/fs/erofs/utils.c
@@ -7,7 +7,7 @@
#include "internal.h"
#include <linux/pagevec.h>
-struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp, bool nofail)
+struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp)
{
struct page *page;
@@ -16,7 +16,7 @@ struct page *erofs_allocpage(struct list_head *pool, gfp_t gfp, bool nofail)
DBG_BUGON(page_ref_count(page) != 1);
list_del(&page->lru);
} else {
- page = alloc_pages(gfp | (nofail ? __GFP_NOFAIL : 0), 0);
+ page = alloc_page(gfp);
}
return page;
}
diff --git a/fs/erofs/zdata.c b/fs/erofs/zdata.c
index 93f8bc1a64f6..1c582a3a40a3 100644
--- a/fs/erofs/zdata.c
+++ b/fs/erofs/zdata.c
@@ -546,15 +546,6 @@ static bool z_erofs_collector_end(struct z_erofs_collector *clt)
return true;
}
-static inline struct page *__stagingpage_alloc(struct list_head *pagepool,
- gfp_t gfp)
-{
- struct page *page = erofs_allocpage(pagepool, gfp, true);
-
- page->mapping = Z_EROFS_MAPPING_STAGING;
- return page;
-}
-
static bool should_alloc_managed_pages(struct z_erofs_decompress_frontend *fe,
unsigned int cachestrategy,
erofs_off_t la)
@@ -661,8 +652,9 @@ static int z_erofs_do_read_page(struct z_erofs_decompress_frontend *fe,
/* should allocate an additional staging page for pagevec */
if (err == -EAGAIN) {
struct page *const newpage =
- __stagingpage_alloc(pagepool, GFP_NOFS);
+ erofs_allocpage(pagepool, GFP_NOFS | __GFP_NOFAIL);
+ newpage->mapping = Z_EROFS_MAPPING_STAGING;
err = z_erofs_attach_page(clt, newpage,
Z_EROFS_PAGE_TYPE_EXCLUSIVE);
if (!err)
@@ -1079,19 +1071,24 @@ static struct page *pickup_page_for_submission(struct z_erofs_pcluster *pcl,
unlock_page(page);
put_page(page);
out_allocpage:
- page = __stagingpage_alloc(pagepool, gfp);
- if (oldpage != cmpxchg(&pcl->compressed_pages[nr], oldpage, page)) {
- list_add(&page->lru, pagepool);
- cpu_relax();
- goto repeat;
- }
- if (!tocache)
- goto out;
- if (add_to_page_cache_lru(page, mc, index + nr, gfp)) {
+ page = erofs_allocpage(pagepool, gfp | __GFP_NOFAIL);
+ if (!tocache || add_to_page_cache_lru(page, mc, index + nr, gfp)) {
+ /* non-LRU / non-movable temporary page is needed */
page->mapping = Z_EROFS_MAPPING_STAGING;
- goto out;
+ tocache = false;
}
+ if (oldpage != cmpxchg(&pcl->compressed_pages[nr], oldpage, page)) {
+ if (tocache) {
+ /* since it added to managed cache successfully */
+ unlock_page(page);
+ put_page(page);
+ } else {
+ list_add(&page->lru, pagepool);
+ }
+ cond_resched();
+ goto repeat;
+ }
set_page_private(page, (unsigned long)pcl);
SetPagePrivate(page);
out: /* the only exit (for tracing and debugging) */
--
2.20.1
parent reply other threads:[~2019-11-24 2:56 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
[parent not found: <20191124025217.12345-1-hsiangkao.ref@aol.com>]
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