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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>
This commit is contained in:
Al Viro 2013-10-03 12:46:44 -04:00
parent 2d1d9b5b5c
commit baa40671d3
2 changed files with 5 additions and 9 deletions
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1
fs/autofs4/autofs_i.h
View File

@ -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)

13
fs/autofs4/inode.c
View File

@ -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; autofs4_catatonic_mode(sbi);
/* Free wait queues, close pipe */
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)