[PATCH vfs-2.6 3/6] vfs: add __d_instantiate() helper

This adds __d_instantiate() for users which is already taking
dcache_lock, and replace with it.

The part of d_add_ci() isn't equivalent. But it should be needed
fsnotify_d_instantiate() actually, because the path is to add the
inode to negative dentry.  fsnotify_d_instantiate() should be called
after change from negative to positive.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>

diff --git a/fs/dcache.c b/fs/dcache.c
index 6402400..5a24cee 100644 (file)
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -981,6 +981,15 @@ struct dentry *d_alloc_name(struct dentry *parent, const char *name)
        return d_alloc(parent, &q);
 }
 
+/* the caller must hold dcache_lock */
+static void __d_instantiate(struct dentry *dentry, struct inode *inode)
+{
+       if (inode)
+               list_add(&dentry->d_alias, &inode->i_dentry);
+       dentry->d_inode = inode;
+       fsnotify_d_instantiate(dentry, inode);
+}
+
 /**
  * d_instantiate - fill in inode information for a dentry
  * @entry: dentry to complete
@@ -1000,10 +1009,7 @@ void d_instantiate(struct dentry *entry, struct inode * inode)
 {
        BUG_ON(!list_empty(&entry->d_alias));
        spin_lock(&dcache_lock);
-       if (inode)
-               list_add(&entry->d_alias, &inode->i_dentry);
-       entry->d_inode = inode;
-       fsnotify_d_instantiate(entry, inode);
+       __d_instantiate(entry, inode);
        spin_unlock(&dcache_lock);
        security_d_instantiate(entry, inode);
 }
@@ -1033,7 +1039,7 @@ static struct dentry *__d_instantiate_unique(struct dentry *entry,
        unsigned int hash = entry->d_name.hash;
 
        if (!inode) {
-               entry->d_inode = NULL;
+               __d_instantiate(entry, NULL);
                return NULL;
        }
 
@@ -1052,9 +1058,7 @@ static struct dentry *__d_instantiate_unique(struct dentry *entry,
                return alias;
        }
 
-       list_add(&entry->d_alias, &inode->i_dentry);
-       entry->d_inode = inode;
-       fsnotify_d_instantiate(entry, inode);
+       __d_instantiate(entry, inode);
        return NULL;
 }
 
@@ -1213,10 +1217,8 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry)
                        d_move(new, dentry);
                        iput(inode);
                } else {
-                       /* d_instantiate takes dcache_lock, so we do it by hand */
-                       list_add(&dentry->d_alias, &inode->i_dentry);
-                       dentry->d_inode = inode;
-                       fsnotify_d_instantiate(dentry, inode);
+                       /* already taking dcache_lock, so d_add() by hand */
+                       __d_instantiate(dentry, inode);
                        spin_unlock(&dcache_lock);
                        security_d_instantiate(dentry, inode);
                        d_rehash(dentry);
@@ -1299,8 +1301,7 @@ struct dentry *d_add_ci(struct dentry *dentry, struct inode *inode,
                 * d_instantiate() by hand because it takes dcache_lock which
                 * we already hold.
                 */
-               list_add(&found->d_alias, &inode->i_dentry);
-               found->d_inode = inode;
+               __d_instantiate(found, inode);
                spin_unlock(&dcache_lock);
                security_d_instantiate(found, inode);
                return found;
@@ -1833,7 +1834,7 @@ struct dentry *d_materialise_unique(struct dentry *dentry, struct inode *inode)
 
        if (!inode) {
                actual = dentry;
-               dentry->d_inode = NULL;
+               __d_instantiate(dentry, NULL);
                goto found_lock;
        }