tree a343a74d51c1509485baf5f804ddbe1732cd6efe
parent abd63f44a170e72fadcdad35fb508722352c4deb
author Chao Yu <yuchao0@huawei.com> 1504176966 +0800
committer Jaegeuk Kim <jaegeuk@kernel.org> 1506027365 -0700

f2fs: fix to wake up all sleeping flusher

In scenario of remount_ro vs flush, after flush_thread exits in
->remount_fs, flusher will only clean up golbal issue_list, but
without waking up flushers waiting on that list, result in hang
related user threads.

In order to fix this issue, this patch enables the flusher to
take charge of issue_flush thread: executes merged flush command,
and wake up all sleeping flushers.

Fixes: 5eba8c5d1fb3 ("f2fs: fix to access nullified flush_cmd_control pointer")
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>