move d_rcu from overlapping d_child to overlapping d_alias

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 26 insertions, 27 deletions

diff --git a/fs/dcache.c b/fs/dcache.c
index 3ffef7f4e5cd..8b4c45e40834 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -44,7 +44,7 @@
 /*
  * Usage:
  * dcache->d_inode->i_lock protects:
- *   - i_dentry, d_alias, d_inode of aliases
+ *   - i_dentry, d_u.d_alias, d_inode of aliases
  * dcache_hash_bucket lock protects:
  *   - the dcache hash table
  * s_anon bl list spinlock protects:
@@ -59,7 +59,7 @@
  *   - d_unhashed()
  *   - d_parent and d_subdirs
  *   - childrens' d_child and d_parent
- *   - d_alias, d_inode
+ *   - d_u.d_alias, d_inode
  *
  * Ordering:
  * dentry->d_inode->i_lock
@@ -252,14 +252,12 @@ static void __d_free(struct rcu_head *head)
 {
         struct dentry *dentry = container_of(head, struct dentry, d_u.d_rcu);
 
-        WARN_ON(!hlist_unhashed(&dentry->d_alias));
         kmem_cache_free(dentry_cache, dentry); 
 }
 
 static void __d_free_external(struct rcu_head *head)
 {
         struct dentry *dentry = container_of(head, struct dentry, d_u.d_rcu);
-        WARN_ON(!hlist_unhashed(&dentry->d_alias));
         kfree(external_name(dentry));
         kmem_cache_free(dentry_cache, dentry); 
 }
@@ -271,6 +269,7 @@ static inline int dname_external(const struct dentry *dentry)
 
 static void dentry_free(struct dentry *dentry)
 {
+        WARN_ON(!hlist_unhashed(&dentry->d_u.d_alias));
         if (unlikely(dname_external(dentry))) {
                 struct external_name *p = external_name(dentry);
                 if (likely(atomic_dec_and_test(&p->u.count))) {
@@ -311,7 +310,7 @@ static void dentry_iput(struct dentry * dentry)
         struct inode *inode = dentry->d_inode;
         if (inode) {
                 dentry->d_inode = NULL;
-                hlist_del_init(&dentry->d_alias);
+                hlist_del_init(&dentry->d_u.d_alias);
                 spin_unlock(&dentry->d_lock);
                 spin_unlock(&inode->i_lock);
                 if (!inode->i_nlink)
@@ -336,7 +335,7 @@ static void dentry_unlink_inode(struct dentry * dentry)
         struct inode *inode = dentry->d_inode;
         __d_clear_type(dentry);
         dentry->d_inode = NULL;
-        hlist_del_init(&dentry->d_alias);
+        hlist_del_init(&dentry->d_u.d_alias);
         dentry_rcuwalk_barrier(dentry);
         spin_unlock(&dentry->d_lock);
         spin_unlock(&inode->i_lock);
@@ -496,7 +495,7 @@ static void __dentry_kill(struct dentry *dentry)
         }
         /* if it was on the hash then remove it */
         __d_drop(dentry);
-        list_del(&dentry->d_u.d_child);
+        list_del(&dentry->d_child);
         /*
          * Inform d_walk() that we are no longer attached to the
          * dentry tree
@@ -722,7 +721,7 @@ static struct dentry *__d_find_alias(struct inode *inode)
 
 again:
         discon_alias = NULL;
-        hlist_for_each_entry(alias, &inode->i_dentry, d_alias) {
+        hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
                 spin_lock(&alias->d_lock);
                 if (S_ISDIR(inode->i_mode) || !d_unhashed(alias)) {
                         if (IS_ROOT(alias) &&
@@ -772,7 +771,7 @@ void d_prune_aliases(struct inode *inode)
         struct dentry *dentry;
 restart:
         spin_lock(&inode->i_lock);
-        hlist_for_each_entry(dentry, &inode->i_dentry, d_alias) {
+        hlist_for_each_entry(dentry, &inode->i_dentry, d_u.d_alias) {
                 spin_lock(&dentry->d_lock);
                 if (!dentry->d_lockref.count) {
                         struct dentry *parent = lock_parent(dentry);
@@ -1050,7 +1049,7 @@ repeat:
 resume:
         while (next != &this_parent->d_subdirs) {
                 struct list_head *tmp = next;
-                struct dentry *dentry = list_entry(tmp, struct dentry, d_u.d_child);
+                struct dentry *dentry = list_entry(tmp, struct dentry, d_child);
                 next = tmp->next;
 
                 spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
@@ -1102,7 +1101,7 @@ resume:
                         goto rename_retry;
                 }
                 rcu_read_unlock();
-                next = child->d_u.d_child.next;
+                next = child->d_child.next;
                 goto resume;
         }
         if (need_seqretry(&rename_lock, seq)) {
@@ -1454,8 +1453,8 @@ struct dentry *__d_alloc(struct super_block *sb, const struct qstr *name)
         INIT_HLIST_BL_NODE(&dentry->d_hash);
         INIT_LIST_HEAD(&dentry->d_lru);
         INIT_LIST_HEAD(&dentry->d_subdirs);
-        INIT_HLIST_NODE(&dentry->d_alias);
-        INIT_LIST_HEAD(&dentry->d_u.d_child);
+        INIT_HLIST_NODE(&dentry->d_u.d_alias);
+        INIT_LIST_HEAD(&dentry->d_child);
         d_set_d_op(dentry, dentry->d_sb->s_d_op);
 
         this_cpu_inc(nr_dentry);
@@ -1485,7 +1484,7 @@ struct dentry *d_alloc(struct dentry * parent, const struct qstr *name)
          */
         __dget_dlock(parent);
         dentry->d_parent = parent;
-        list_add(&dentry->d_u.d_child, &parent->d_subdirs);
+        list_add(&dentry->d_child, &parent->d_subdirs);
         spin_unlock(&parent->d_lock);
 
         return dentry;
@@ -1578,7 +1577,7 @@ static void __d_instantiate(struct dentry *dentry, struct inode *inode)
         spin_lock(&dentry->d_lock);
         __d_set_type(dentry, add_flags);
         if (inode)
-                hlist_add_head(&dentry->d_alias, &inode->i_dentry);
+                hlist_add_head(&dentry->d_u.d_alias, &inode->i_dentry);
         dentry->d_inode = inode;
         dentry_rcuwalk_barrier(dentry);
         spin_unlock(&dentry->d_lock);
@@ -1602,7 +1601,7 @@ static void __d_instantiate(struct dentry *dentry, struct inode *inode)
  
 void d_instantiate(struct dentry *entry, struct inode * inode)
 {
-        BUG_ON(!hlist_unhashed(&entry->d_alias));
+        BUG_ON(!hlist_unhashed(&entry->d_u.d_alias));
         if (inode)
                 spin_lock(&inode->i_lock);
         __d_instantiate(entry, inode);
@@ -1641,7 +1640,7 @@ static struct dentry *__d_instantiate_unique(struct dentry *entry,
                 return NULL;
         }
 
-        hlist_for_each_entry(alias, &inode->i_dentry, d_alias) {
+        hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) {
                 /*
                  * Don't need alias->d_lock here, because aliases with
                  * d_parent == entry->d_parent are not subject to name or
@@ -1667,7 +1666,7 @@ struct dentry *d_instantiate_unique(struct dentry *entry, struct inode *inode)
 {
         struct dentry *result;
 
-        BUG_ON(!hlist_unhashed(&entry->d_alias));
+        BUG_ON(!hlist_unhashed(&entry->d_u.d_alias));
 
         if (inode)
                 spin_lock(&inode->i_lock);
@@ -1698,7 +1697,7 @@ EXPORT_SYMBOL(d_instantiate_unique);
  */
 int d_instantiate_no_diralias(struct dentry *entry, struct inode *inode)
 {
-        BUG_ON(!hlist_unhashed(&entry->d_alias));
+        BUG_ON(!hlist_unhashed(&entry->d_u.d_alias));
 
         spin_lock(&inode->i_lock);
         if (S_ISDIR(inode->i_mode) && !hlist_empty(&inode->i_dentry)) {
@@ -1737,7 +1736,7 @@ static struct dentry * __d_find_any_alias(struct inode *inode)
 
         if (hlist_empty(&inode->i_dentry))
                 return NULL;
-        alias = hlist_entry(inode->i_dentry.first, struct dentry, d_alias);
+        alias = hlist_entry(inode->i_dentry.first, struct dentry, d_u.d_alias);
         __dget(alias);
         return alias;
 }
@@ -1799,7 +1798,7 @@ static struct dentry *__d_obtain_alias(struct inode *inode, int disconnected)
         spin_lock(&tmp->d_lock);
         tmp->d_inode = inode;
         tmp->d_flags |= add_flags;
-        hlist_add_head(&tmp->d_alias, &inode->i_dentry);
+        hlist_add_head(&tmp->d_u.d_alias, &inode->i_dentry);
         hlist_bl_lock(&tmp->d_sb->s_anon);
         hlist_bl_add_head(&tmp->d_hash, &tmp->d_sb->s_anon);
         hlist_bl_unlock(&tmp->d_sb->s_anon);
@@ -2234,7 +2233,7 @@ int d_validate(struct dentry *dentry, struct dentry *dparent)
         struct dentry *child;
 
         spin_lock(&dparent->d_lock);
-        list_for_each_entry(child, &dparent->d_subdirs, d_u.d_child) {
+        list_for_each_entry(child, &dparent->d_subdirs, d_child) {
                 if (dentry == child) {
                         spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
                         __dget_dlock(dentry);
@@ -2525,13 +2524,13 @@ static void __d_move(struct dentry *dentry, struct dentry *target,
                 /* splicing a tree */
                 dentry->d_parent = target->d_parent;
                 target->d_parent = target;
-                list_del_init(&target->d_u.d_child);
-                list_move(&dentry->d_u.d_child, &dentry->d_parent->d_subdirs);
+                list_del_init(&target->d_child);
+                list_move(&dentry->d_child, &dentry->d_parent->d_subdirs);
         } else {
                 /* swapping two dentries */
                 swap(dentry->d_parent, target->d_parent);
-                list_move(&target->d_u.d_child, &target->d_parent->d_subdirs);
-                list_move(&dentry->d_u.d_child, &dentry->d_parent->d_subdirs);
+                list_move(&target->d_child, &target->d_parent->d_subdirs);
+                list_move(&dentry->d_child, &dentry->d_parent->d_subdirs);
                 if (exchange)
                         fsnotify_d_move(target);
                 fsnotify_d_move(dentry);
@@ -3320,7 +3319,7 @@ void d_tmpfile(struct dentry *dentry, struct inode *inode)
 {
         inode_dec_link_count(inode);
         BUG_ON(dentry->d_name.name != dentry->d_iname ||
-                !hlist_unhashed(&dentry->d_alias) ||
+                !hlist_unhashed(&dentry->d_u.d_alias) ||
                 !d_unlinked(dentry));
         spin_lock(&dentry->d_parent->d_lock);
         spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);