makes proc_pid_ns() safe from rcu pathwalk (put_pid_ns()
is still synchronous, but that's not a problem - it does
rcu-delay everything that needs to be)
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
fs/proc/root.c | 2 +-
include/linux/proc_fs.h | 1 +
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/proc/root.c b/fs/proc/root.c
index 9191248f2dac..d3148e1d883b 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -271,7 +271,7 @@ static void proc_kill_sb(struct super_block *sb)
kill_anon_super(sb);
put_pid_ns(fs_info->pid_ns);
- kfree(fs_info);
+ kfree_rcu(fs_info, rcu);
}
static struct file_system_type proc_fs_type = {
diff --git a/include/linux/proc_fs.h b/include/linux/proc_fs.h
index de407e7c3b55..0b2a89854440 100644
--- a/include/linux/proc_fs.h
+++ b/include/linux/proc_fs.h
@@ -65,6 +65,7 @@ struct proc_fs_info {
kgid_t pid_gid;
enum proc_hidepid hide_pid;
enum proc_pidonly pidonly;
+ struct rcu_head rcu;
};
static inline struct proc_fs_info *proc_sb_info(struct super_block *sb)
--
2.39.2
