From baa40671d3e3b590a33b2c0e022db61cbebf5c00 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 3 Oct 2013 12:46:44 -0400 Subject: [PATCH] autofs4: make freeing sbi rcu-delayed makes ->d_managed() safety in RCU mode independent from vfsmount_lock Signed-off-by: Al Viro --- fs/autofs4/autofs_i.h | 1 + fs/autofs4/inode.c | 13 ++++--------- 2 files changed, 5 insertions(+), 9 deletions(-) diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h index ebab147e..4218e26 100644 --- a/fs/autofs4/autofs_i.h +++ b/fs/autofs4/autofs_i.h @@ -122,6 +122,7 @@ struct autofs_sb_info { spinlock_t lookup_lock; struct list_head active_list; struct list_head expiring_list; + struct rcu_head rcu; }; static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb) diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c index b104726..3b9cc9b 100644 --- a/fs/autofs4/inode.c +++ b/fs/autofs4/inode.c @@ -56,18 +56,13 @@ void autofs4_kill_sb(struct super_block *sb) * just call kill_anon_super when we are called from * deactivate_super. */ - if (!sbi) - goto out_kill_sb; - - /* Free wait queues, close pipe */ - autofs4_catatonic_mode(sbi); - - sb->s_fs_info = NULL; - kfree(sbi); + if (sbi) /* Free wait queues, close pipe */ + autofs4_catatonic_mode(sbi); -out_kill_sb: DPRINTK("shutting down"); kill_litter_super(sb); + if (sbi) + kfree_rcu(sbi, rcu); } static int autofs4_show_options(struct seq_file *m, struct dentry *root) -- 2.7.4