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-rw-r--r--fs/dcache.c4
-rw-r--r--include/linux/dcache.h12
2 files changed, 14 insertions, 2 deletions
diff --git a/fs/dcache.c b/fs/dcache.c
index bec4de1..1b4a3a3 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1339,10 +1339,10 @@ void d_move(struct dentry * dentry, struct dentry * target)
*/
if (target < dentry) {
spin_lock(&target->d_lock);
- spin_lock(&dentry->d_lock);
+ spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
} else {
spin_lock(&dentry->d_lock);
- spin_lock(&target->d_lock);
+ spin_lock_nested(&target->d_lock, DENTRY_D_LOCK_NESTED);
}
/* Move the dentry to the target hash queue, if on different bucket */
diff --git a/include/linux/dcache.h b/include/linux/dcache.h
index 0dd1610..471781f 100644
--- a/include/linux/dcache.h
+++ b/include/linux/dcache.h
@@ -114,6 +114,18 @@ struct dentry {
unsigned char d_iname[DNAME_INLINE_LEN_MIN]; /* small names */
};
+/*
+ * dentry->d_lock spinlock nesting subclasses:
+ *
+ * 0: normal
+ * 1: nested
+ */
+enum dentry_d_lock_class
+{
+ DENTRY_D_LOCK_NORMAL, /* implicitly used by plain spin_lock() APIs. */
+ DENTRY_D_LOCK_NESTED
+};
+
struct dentry_operations {
int (*d_revalidate)(struct dentry *, struct nameidata *);
int (*d_hash) (struct dentry *, struct qstr *);
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