linux-kernel - [PATCH 2/4] f2fs: don't trigger data flush in foreground operation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200319115800.108926-2-yuchao0@huawei.com>
Date:   Thu, 19 Mar 2020 19:57:58 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>,
        Chao Yu <yuchao0@...wei.com>
Subject: [PATCH 2/4] f2fs: don't trigger data flush in foreground operation

Data flush can generate heavy IO and cause long latency during
flush, so it's not appropriate to trigger it in foreground
operation.

And also, we may face below potential deadlock during data flush:
- f2fs_write_multi_pages
 - f2fs_write_raw_pages
  - f2fs_write_single_data_page
   - f2fs_balance_fs
    - f2fs_balance_fs_bg
     - f2fs_sync_dirty_inodes
      - filemap_fdatawrite   -- stuck on flush same cluster

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 fs/f2fs/f2fs.h    | 2 +-
 fs/f2fs/gc.c      | 2 +-
 fs/f2fs/node.c    | 2 +-
 fs/f2fs/segment.c | 6 +++---
 4 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 422a070526e5..09db79a20f8e 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3246,7 +3246,7 @@ void f2fs_drop_inmem_pages(struct inode *inode);
 void f2fs_drop_inmem_page(struct inode *inode, struct page *page);
 int f2fs_commit_inmem_pages(struct inode *inode);
 void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need);
-void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi);
+void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi, bool from_bg);
 int f2fs_issue_flush(struct f2fs_sb_info *sbi, nid_t ino);
 int f2fs_create_flush_cmd_control(struct f2fs_sb_info *sbi);
 int f2fs_flush_device_cache(struct f2fs_sb_info *sbi);
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index f122fe3dbba3..26248c8936db 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -113,7 +113,7 @@ static int gc_thread_func(void *data)
 				prefree_segments(sbi), free_segments(sbi));
 
 		/* balancing f2fs's metadata periodically */
-		f2fs_balance_fs_bg(sbi);
+		f2fs_balance_fs_bg(sbi, true);
 next:
 		sb_end_write(sbi->sb);
 
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 542335bdc100..ecbd6bd14a49 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1976,7 +1976,7 @@ static int f2fs_write_node_pages(struct address_space *mapping,
 		goto skip_write;
 
 	/* balancing f2fs's metadata in background */
-	f2fs_balance_fs_bg(sbi);
+	f2fs_balance_fs_bg(sbi, true);
 
 	/* collect a number of dirty node pages and write together */
 	if (wbc->sync_mode != WB_SYNC_ALL &&
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 601d67e72c50..aece09a184fa 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -496,7 +496,7 @@ void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need)
 
 	/* balance_fs_bg is able to be pending */
 	if (need && excess_cached_nats(sbi))
-		f2fs_balance_fs_bg(sbi);
+		f2fs_balance_fs_bg(sbi, false);
 
 	if (!f2fs_is_checkpoint_ready(sbi))
 		return;
@@ -511,7 +511,7 @@ void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need)
 	}
 }
 
-void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
+void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi, bool from_bg)
 {
 	if (unlikely(is_sbi_flag_set(sbi, SBI_POR_DOING)))
 		return;
@@ -540,7 +540,7 @@ void f2fs_balance_fs_bg(struct f2fs_sb_info *sbi)
 			excess_dirty_nats(sbi) ||
 			excess_dirty_nodes(sbi) ||
 			f2fs_time_over(sbi, CP_TIME)) {
-		if (test_opt(sbi, DATA_FLUSH)) {
+		if (test_opt(sbi, DATA_FLUSH) && from_bg) {
 			struct blk_plug plug;
 
 			mutex_lock(&sbi->flush_lock);
-- 
2.18.0.rc1