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-rw-r--r--fs/dcache.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index 85c9e2bff8e6..40469044088d 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -683,6 +683,8 @@ EXPORT_SYMBOL(dget_parent);
/**
* d_find_alias - grab a hashed alias of inode
* @inode: inode in question
+ * @want_discon: flag, used by d_splice_alias, to request
+ * that only a DISCONNECTED alias be returned.
*
* If inode has a hashed alias, or is a directory and has any alias,
* acquire the reference to alias and return it. Otherwise return NULL.
@@ -691,9 +693,10 @@ EXPORT_SYMBOL(dget_parent);
* of a filesystem.
*
* If the inode has an IS_ROOT, DCACHE_DISCONNECTED alias, then prefer
- * any other hashed alias over that.
+ * any other hashed alias over that one unless @want_discon is set,
+ * in which case only return an IS_ROOT, DCACHE_DISCONNECTED alias.
*/
-static struct dentry *__d_find_alias(struct inode *inode)
+static struct dentry *__d_find_alias(struct inode *inode, int want_discon)
{
struct dentry *alias, *discon_alias;
@@ -705,7 +708,7 @@ again:
if (IS_ROOT(alias) &&
(alias->d_flags & DCACHE_DISCONNECTED)) {
discon_alias = alias;
- } else {
+ } else if (!want_discon) {
__dget_dlock(alias);
spin_unlock(&alias->d_lock);
return alias;
@@ -736,7 +739,7 @@ struct dentry *d_find_alias(struct inode *inode)
if (!list_empty(&inode->i_dentry)) {
spin_lock(&inode->i_lock);
- de = __d_find_alias(inode);
+ de = __d_find_alias(inode, 0);
spin_unlock(&inode->i_lock);
}
return de;
@@ -1647,8 +1650,9 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry)
if (inode && S_ISDIR(inode->i_mode)) {
spin_lock(&inode->i_lock);
- new = __d_find_any_alias(inode);
+ new = __d_find_alias(inode, 1);
if (new) {
+ BUG_ON(!(new->d_flags & DCACHE_DISCONNECTED));
spin_unlock(&inode->i_lock);
security_d_instantiate(new, inode);
d_move(new, dentry);
@@ -2478,7 +2482,7 @@ struct dentry *d_materialise_unique(struct dentry *dentry, struct inode *inode)
struct dentry *alias;
/* Does an aliased dentry already exist? */
- alias = __d_find_alias(inode);
+ alias = __d_find_alias(inode, 0);
if (alias) {
actual = alias;
write_seqlock(&rename_lock);