f2fs: avoid f2fs_lock_op for IPU writes
Currently, if we do get_node_of_data before f2fs_lock_op, there may be dead lock
as follows, where process A would be in infinite loop, and B will NOT be awaked.
Process A(cp): Process B:
f2fs_lock_all(sbi)
get_dnode_of_data <---- lock dn.node_page
flush_nodes f2fs_lock_op
So, this patch adds f2fs_trylock_op to avoid f2fs_lock_op done by IPU.
Signed-off-by: Hou Pengyang <houpengyang@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index e2b1355..14c71ac 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -719,7 +719,7 @@
.old_blkaddr = NULL_ADDR,
.page = page,
.encrypted_page = NULL,
- .need_lock = true,
+ .need_lock = LOCK_REQ,
};
bool is_dirty = PageDirty(page);
int err;