nilfs2: fix imperfect completion wait in nilfs_wait_on_logs

nilfs_wait_on_logs has a potential to slip out before completion of
all bio requests when it met an error.  This synchronization fault may
cause unexpected results, for instance, violative access to freed
segment buffers from an end-bio callback routine.

This fixes the issue by ensuring that nilfs_wait_on_logs waits all
given logs.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c
index 636eaafd6ea257c7bfaf53dc7b7ce8399f81a103..6129a431aa3401b3f637fd6354925373c7c45a01 100644 (file)
--- a/fs/nilfs2/segbuf.c
+++ b/fs/nilfs2/segbuf.c
@@ -323,14 +323,14 @@ int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs)
 int nilfs_wait_on_logs(struct list_head *logs)
 {
        struct nilfs_segment_buffer *segbuf;
-       int err;
+       int err, ret = 0;
 
        list_for_each_entry(segbuf, logs, sb_list) {
                err = nilfs_segbuf_wait(segbuf);
-               if (err)
-                       return err;
+               if (err && !ret)
+                       ret = err;
        }
-       return 0;
+       return ret;
 }
 
 /*