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Subject[PATCH 2/2] f2fs: detect synchronous writeback more earlier
Date
From: Chao Yu <yuchao0@huawei.com>

This patch changes to detect synchronous writeback more earlier before,
in order to avoid unnecessary page writeback before exiting asynchronous
writeback.

Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
fs/f2fs/data.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index feb4c224b305..91cbf20b448a 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1919,6 +1919,13 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
struct page *page = pvec.pages[i];
bool submitted = false;

+ /* give a priority to WB_SYNC threads */
+ if (atomic_read(&F2FS_M_SB(mapping)->wb_sync_req) &&
+ wbc->sync_mode == WB_SYNC_NONE) {
+ done = 1;
+ break;
+ }
+
done_index = page->index;
retry_write:
lock_page(page);
@@ -1973,9 +1980,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping,
last_idx = page->index;
}

- /* give a priority to WB_SYNC threads */
- if ((atomic_read(&F2FS_M_SB(mapping)->wb_sync_req) ||
- --wbc->nr_to_write <= 0) &&
+ if (--wbc->nr_to_write <= 0 &&
wbc->sync_mode == WB_SYNC_NONE) {
done = 1;
break;
--
2.16.2.17.g38e79b1fd
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