diff options
| author | Louis Rilling <louis.rilling@kerlabs.com> | 2008-08-15 12:37:23 -0700 |
|---|---|---|
| committer | Mark Fasheh <mfasheh@suse.com> | 2008-08-22 11:09:02 -0700 |
| commit | de6bf18e9ce0df807dab08cff08751cac383429d (patch) | |
| tree | 3e60e9f88b4da4711a34df273c99a348bdc10236 /fs/configfs | |
| parent | 9780eb6cfaf7d2d5ccc061eaf94e7aec6a17791e (diff) | |
| download | lwn-de6bf18e9ce0df807dab08cff08751cac383429d.tar.gz lwn-de6bf18e9ce0df807dab08cff08751cac383429d.zip | |
[PATCH] configfs: Consolidate locking around configfs_detach_prep() in configfs_rmdir()
It appears that configfs_rmdir() can protect configfs_detach_prep() retries with
less calls to {spin,mutex}_{lock,unlock}, and a cleaner code.
This patch does not change any behavior, except that it removes two useless
lock/unlock pairs having nothing inside to protect and providing a useless
barrier.
Signed-off-by: Louis Rilling <louis.rilling@kerlabs.com>
Signed-off-by: Joel Becker <Joel.Becker@oracle.com>
Signed-off-by: Mark Fasheh <mfasheh@suse.com>
Diffstat (limited to 'fs/configfs')
| -rw-r--r-- | fs/configfs/dir.c | 17 |
1 files changed, 7 insertions, 10 deletions
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index 7a8db78a91d2..8e93341f3e82 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -1311,16 +1311,18 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry) * 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; + mutex_lock(&configfs_symlink_mutex); + spin_lock(&configfs_dirent_lock); ret = configfs_detach_prep(dentry, &wait_mutex); - if (ret) { + if (ret) configfs_detach_rollback(dentry); - spin_unlock(&configfs_dirent_lock); - mutex_unlock(&configfs_symlink_mutex); + spin_unlock(&configfs_dirent_lock); + mutex_unlock(&configfs_symlink_mutex); + + if (ret) { if (ret != -EAGAIN) { config_item_put(parent_item); return ret; @@ -1329,13 +1331,8 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry) /* Wait until the racing operation terminates */ 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); |