From ec9895add2c519681c45a8599262d1d9b4986349 Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Wed, 26 Apr 2017 17:39:54 +0800 Subject: f2fs: don't hold cmd_lock during waiting discard command Previously, with protection of cmd_lock, we will wait for end io of discard command which potentially may lead long latency, making worse concurrency. So, in this patch, we try to add reference into discard entry to prevent the entry being released by other thread, then we can avoid holding global cmd_lock during waiting discard to finish. Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/f2fs.h | 1 + 1 file changed, 1 insertion(+) (limited to 'fs/f2fs/f2fs.h') diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 9228a36ded41..5759671fc948 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -219,6 +219,7 @@ struct discard_cmd { struct list_head list; /* command list */ struct completion wait; /* compleation */ struct block_device *bdev; /* bdev */ + unsigned short ref; /* reference count */ int state; /* state */ int error; /* bio error */ }; -- cgit v1.2.3