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-rw-r--r--fs/reiserfs/lock.c9
-rw-r--r--include/linux/reiserfs_fs.h9
2 files changed, 18 insertions, 0 deletions
diff --git a/fs/reiserfs/lock.c b/fs/reiserfs/lock.c
index ee2cfc0..b87aa2c 100644
--- a/fs/reiserfs/lock.c
+++ b/fs/reiserfs/lock.c
@@ -86,3 +86,12 @@ void reiserfs_check_lock_depth(struct super_block *sb, char *caller)
reiserfs_panic(sb, "%s called without kernel lock held %d",
caller);
}
+
+#ifdef CONFIG_REISERFS_CHECK
+void reiserfs_lock_check_recursive(struct super_block *sb)
+{
+ struct reiserfs_sb_info *sb_i = REISERFS_SB(sb);
+
+ WARN_ONCE((sb_i->lock_depth > 0), "Unwanted recursive reiserfs lock!\n");
+}
+#endif
diff --git a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
index 35d3f45..793bf83 100644
--- a/include/linux/reiserfs_fs.h
+++ b/include/linux/reiserfs_fs.h
@@ -62,6 +62,12 @@ void reiserfs_write_unlock(struct super_block *s);
int reiserfs_write_lock_once(struct super_block *s);
void reiserfs_write_unlock_once(struct super_block *s, int lock_depth);
+#ifdef CONFIG_REISERFS_CHECK
+void reiserfs_lock_check_recursive(struct super_block *s);
+#else
+static inline void reiserfs_lock_check_recursive(struct super_block *s) { }
+#endif
+
/*
* Several mutexes depend on the write lock.
* However sometimes we want to relax the write lock while we hold
@@ -92,6 +98,7 @@ void reiserfs_write_unlock_once(struct super_block *s, int lock_depth);
static inline void reiserfs_mutex_lock_safe(struct mutex *m,
struct super_block *s)
{
+ reiserfs_lock_check_recursive(s);
reiserfs_write_unlock(s);
mutex_lock(m);
reiserfs_write_lock(s);
@@ -101,6 +108,7 @@ static inline void
reiserfs_mutex_lock_nested_safe(struct mutex *m, unsigned int subclass,
struct super_block *s)
{
+ reiserfs_lock_check_recursive(s);
reiserfs_write_unlock(s);
mutex_lock_nested(m, subclass);
reiserfs_write_lock(s);
@@ -109,6 +117,7 @@ reiserfs_mutex_lock_nested_safe(struct mutex *m, unsigned int subclass,
static inline void
reiserfs_down_read_safe(struct rw_semaphore *sem, struct super_block *s)
{
+ reiserfs_lock_check_recursive(s);
reiserfs_write_unlock(s);
down_read(sem);
reiserfs_write_lock(s);
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