autofs4: make freeing sbi rcu-delayed
makes ->d_managed() safety in RCU mode independent from vfsmount_lock Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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2d1d9b5b5c
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baa40671d3
2 changed files with 5 additions and 9 deletions
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@ -122,6 +122,7 @@ struct autofs_sb_info {
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spinlock_t lookup_lock;
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struct list_head active_list;
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struct list_head expiring_list;
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struct rcu_head rcu;
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};
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static inline struct autofs_sb_info *autofs4_sbi(struct super_block *sb)
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@ -56,18 +56,13 @@ void autofs4_kill_sb(struct super_block *sb)
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* just call kill_anon_super when we are called from
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* deactivate_super.
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*/
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if (!sbi)
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goto out_kill_sb;
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if (sbi) /* Free wait queues, close pipe */
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autofs4_catatonic_mode(sbi);
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/* Free wait queues, close pipe */
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autofs4_catatonic_mode(sbi);
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sb->s_fs_info = NULL;
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kfree(sbi);
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out_kill_sb:
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DPRINTK("shutting down");
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kill_litter_super(sb);
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if (sbi)
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kfree_rcu(sbi, rcu);
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}
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static int autofs4_show_options(struct seq_file *m, struct dentry *root)
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