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-rw-r--r--fs/configfs/dir.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index 8e93341..9c23583 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -553,12 +553,24 @@ static void detach_groups(struct config_group *group)
child = sd->s_dentry;
+ /*
+ * Note: we hide this from lockdep since we have no way
+ * to teach lockdep about recursive
+ * I_MUTEX_PARENT -> I_MUTEX_CHILD patterns along a path
+ * in an inode tree, which are valid as soon as
+ * I_MUTEX_PARENT -> I_MUTEX_CHILD is valid from a
+ * parent inode to one of its children.
+ */
+ lockdep_off();
mutex_lock(&child->d_inode->i_mutex);
+ lockdep_on();
configfs_detach_group(sd->s_element);
child->d_inode->i_flags |= S_DEAD;
+ lockdep_off();
mutex_unlock(&child->d_inode->i_mutex);
+ lockdep_on();
d_delete(child);
dput(child);
@@ -748,11 +760,22 @@ static int configfs_attach_item(struct config_item *parent_item,
* We are going to remove an inode and its dentry but
* the VFS may already have hit and used them. Thus,
* we must lock them as rmdir() would.
+ *
+ * Note: we hide this from lockdep since we have no way
+ * to teach lockdep about recursive
+ * I_MUTEX_PARENT -> I_MUTEX_CHILD patterns along a path
+ * in an inode tree, which are valid as soon as
+ * I_MUTEX_PARENT -> I_MUTEX_CHILD is valid from a
+ * parent inode to one of its children.
*/
+ lockdep_off();
mutex_lock(&dentry->d_inode->i_mutex);
+ lockdep_on();
configfs_remove_dir(item);
dentry->d_inode->i_flags |= S_DEAD;
+ lockdep_off();
mutex_unlock(&dentry->d_inode->i_mutex);
+ lockdep_on();
d_delete(dentry);
}
}
@@ -787,14 +810,25 @@ static int configfs_attach_group(struct config_item *parent_item,
*
* We must also lock the inode to remove it safely in case of
* error, as rmdir() would.
+ *
+ * Note: we hide this from lockdep since we have no way
+ * to teach lockdep about recursive
+ * I_MUTEX_PARENT -> I_MUTEX_CHILD patterns along a path
+ * in an inode tree, which are valid as soon as
+ * I_MUTEX_PARENT -> I_MUTEX_CHILD is valid from a
+ * parent inode to one of its children.
*/
+ lockdep_off();
mutex_lock_nested(&dentry->d_inode->i_mutex, I_MUTEX_CHILD);
+ lockdep_on();
ret = populate_groups(to_config_group(item));
if (ret) {
configfs_detach_item(item);
dentry->d_inode->i_flags |= S_DEAD;
}
+ lockdep_off();
mutex_unlock(&dentry->d_inode->i_mutex);
+ lockdep_on();
if (ret)
d_delete(dentry);
}
@@ -956,7 +990,17 @@ static int configfs_depend_prep(struct dentry *origin,
BUG_ON(!origin || !sd);
/* Lock this guy on the way down */
+ /*
+ * Note: we hide this from lockdep since we have no way
+ * to teach lockdep about recursive
+ * I_MUTEX_PARENT -> I_MUTEX_CHILD patterns along a path
+ * in an inode tree, which are valid as soon as
+ * I_MUTEX_PARENT -> I_MUTEX_CHILD is valid from a
+ * parent inode to one of its children.
+ */
+ lockdep_off();
mutex_lock(&sd->s_dentry->d_inode->i_mutex);
+ lockdep_on();
if (sd->s_element == target) /* Boo-yah */
goto out;
@@ -970,7 +1014,9 @@ static int configfs_depend_prep(struct dentry *origin,
}
/* We looped all our children and didn't find target */
+ lockdep_off();
mutex_unlock(&sd->s_dentry->d_inode->i_mutex);
+ lockdep_on();
ret = -ENOENT;
out:
@@ -990,11 +1036,16 @@ static void configfs_depend_rollback(struct dentry *origin,
struct dentry *dentry = item->ci_dentry;
while (dentry != origin) {
+ /* See comments in configfs_depend_prep() */
+ lockdep_off();
mutex_unlock(&dentry->d_inode->i_mutex);
+ lockdep_on();
dentry = dentry->d_parent;
}
+ lockdep_off();
mutex_unlock(&origin->d_inode->i_mutex);
+ lockdep_on();
}
int configfs_depend_item(struct configfs_subsystem *subsys,
@@ -1329,8 +1380,16 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry)
}
/* Wait until the racing operation terminates */
+ /*
+ * Note: we hide this from lockdep since we are locked
+ * with subclass I_MUTEX_NORMAL from vfs_rmdir() (why
+ * not I_MUTEX_CHILD?), and I_MUTEX_XATTR or
+ * I_MUTEX_QUOTA are not relevant for the locked inode.
+ */
+ lockdep_off();
mutex_lock(wait_mutex);
mutex_unlock(wait_mutex);
+ lockdep_on();
}
} while (ret == -EAGAIN);
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