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Commit baa40671 authored by Al Viro's avatar Al Viro
Browse files

autofs4: make freeing sbi rcu-delayed 



makes ->d_managed() safety in RCU mode independent from vfsmount_lock

Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 2d1d9b5b

fs/autofs4/autofs_i.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -122,6 +122,7 @@ struct autofs_sb_info { 
	spinlock_t lookup_lock;

	spinlock_t lookup_lock;

	struct list_head active_list;

	struct list_head active_list;

	struct list_head expiring_list;

	struct list_head expiring_list;

	struct rcu_head rcu;

};

};





static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)

static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)

fs/autofs4/inode.c

+4 −9
Original line number Original line Diff line number Diff line
@@ -56,18 +56,13 @@ void autofs4_kill_sb(struct super_block *sb) 
	 * just call kill_anon_super when we are called from

	 * just call kill_anon_super when we are called from

	 * deactivate_super.

	 * deactivate_super.

	 */

	 */

	if (!sbi)

	if (sbi) /* Free wait queues, close pipe */

		goto out_kill_sb;



	/* Free wait queues, close pipe */

		autofs4_catatonic_mode(sbi);

		autofs4_catatonic_mode(sbi);





	sb->s_fs_info = NULL;

	kfree(sbi);



out_kill_sb:

	DPRINTK("shutting down");

	DPRINTK("shutting down");

	kill_litter_super(sb);

	kill_litter_super(sb);

	if (sbi)

		kfree_rcu(sbi, rcu);

}

}





static int autofs4_show_options(struct seq_file *m, struct dentry *root)

static int autofs4_show_options(struct seq_file *m, struct dentry *root)