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authorChao Yu <yuchao0@huawei.com>2017-08-31 12:56:06 +0200
committerJaegeuk Kim <jaegeuk@kernel.org>2017-09-05 19:50:23 +0200
commitd3238691ed5f7be29f7b8b7cf7c68bbb2924361d (patch)
treea9cca98a6ebe0bd3b764cc91f2ab37ca41675203 /fs/f2fs
parentf2fs: avoid race in between atomic_read & atomic_inc (diff)
downloadlinux-d3238691ed5f7be29f7b8b7cf7c68bbb2924361d.tar.xz
linux-d3238691ed5f7be29f7b8b7cf7c68bbb2924361d.zip
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>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/segment.c23
1 files changed, 21 insertions, 2 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 1215ca1bd4e2..265c3bc44f2d 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -558,8 +558,27 @@ int f2fs_issue_flush(struct f2fs_sb_info *sbi)
wait_for_completion(&cmd.wait);
atomic_dec(&fcc->issing_flush);
} else {
- llist_del_all(&fcc->issue_list);
- atomic_set(&fcc->issing_flush, 0);
+ struct llist_node *list;
+
+ list = llist_del_all(&fcc->issue_list);
+ if (!list) {
+ wait_for_completion(&cmd.wait);
+ atomic_dec(&fcc->issing_flush);
+ } else {
+ struct flush_cmd *tmp, *next;
+
+ ret = submit_flush_wait(sbi);
+
+ llist_for_each_entry_safe(tmp, next, list, llnode) {
+ if (tmp == &cmd) {
+ cmd.ret = ret;
+ atomic_dec(&fcc->issing_flush);
+ continue;
+ }
+ tmp->ret = ret;
+ complete(&tmp->wait);
+ }
+ }
}
return cmd.ret;