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authorIngo Molnar <mingo@elte.hu>2006-07-03 00:25:04 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-03 15:27:06 -0700
commita90b9c05df3c1e58eaedc28795d0f5abd896c098 (patch)
treebc9c1233bad94175abca731daa9120151e0d9c7e
parent13e83599d282ddfd544600df9db5ab343ac4662f (diff)
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[PATCH] lockdep: annotate dcache
Teach special (recursive) locking code to the lock validator. Has no effect on non-lockdep kernels. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-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 bec4de176c8..1b4a3a34ec5 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 0dd1610a94a..471781ffeab 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 *);