diff options
Diffstat (limited to 'fs/configfs/dir.c')
| -rw-r--r-- | fs/configfs/dir.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index cb5ea44..4e228c8 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -1207,6 +1207,11 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry) return -EINVAL; } + /* + * Ensure that no racing symlink() will make detach_prep() fail while + * the new link is temporarily attached + */ + mutex_lock(&configfs_symlink_mutex); spin_lock(&configfs_dirent_lock); do { struct mutex *wait_mutex; @@ -1215,6 +1220,7 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry) if (ret) { configfs_detach_rollback(dentry); spin_unlock(&configfs_dirent_lock); + mutex_unlock(&configfs_symlink_mutex); if (ret != -EAGAIN) { config_item_put(parent_item); return ret; @@ -1224,10 +1230,12 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry) mutex_lock(wait_mutex); mutex_unlock(wait_mutex); + mutex_lock(&configfs_symlink_mutex); spin_lock(&configfs_dirent_lock); } } while (ret == -EAGAIN); spin_unlock(&configfs_dirent_lock); + mutex_unlock(&configfs_symlink_mutex); /* Get a working ref for the duration of this function */ item = configfs_get_config_item(dentry); @@ -1517,11 +1525,13 @@ void configfs_unregister_subsystem(struct configfs_subsystem *subsys) mutex_lock_nested(&configfs_sb->s_root->d_inode->i_mutex, I_MUTEX_PARENT); mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD); + mutex_lock(&configfs_symlink_mutex); spin_lock(&configfs_dirent_lock); if (configfs_detach_prep(dentry, NULL)) { printk(KERN_ERR "configfs: Tried to unregister non-empty subsystem!\n"); } spin_unlock(&configfs_dirent_lock); + mutex_unlock(&configfs_symlink_mutex); configfs_detach_group(&group->cg_item); dentry->d_inode->i_flags |= S_DEAD; mutex_unlock(&dentry->d_inode->i_mutex); |