[PATCH v2 1/7] xfs: Add xfs_is_{i,io,mmap}locked functions

[Pavel Reichl <preichl@redhat.com>]

Add xfs_is_ilocked(), xfs_is_iolocked() and xfs_is_mmaplocked()

Signed-off-by: Pavel Reichl <preichl@redhat.com>
Suggested-by: Dave Chinner <dchinner@redhat.com>
---
 fs/xfs/xfs_inode.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++
 fs/xfs/xfs_inode.h |  3 +++
 2 files changed, 56 insertions(+)

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index c5077e6326c7..80874c80df6d 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -372,6 +372,59 @@ xfs_isilocked(
 	ASSERT(0);
 	return 0;
 }
+
+static inline bool
+__xfs_is_ilocked(
+	struct rw_semaphore	*rwsem,
+	bool			shared,
+	bool			excl)
+{
+	bool locked = false;
+
+	if (!rwsem_is_locked(rwsem))
+		return false;
+
+	if (!debug_locks)
+		return true;
+
+	if (shared)
+		locked = lockdep_is_held_type(rwsem, 0);
+
+	if (excl)
+		locked |= lockdep_is_held_type(rwsem, 1);
+
+	return locked;
+}
+
+bool
+xfs_is_ilocked(
+	struct xfs_inode	*ip,
+	int			lock_flags)
+{
+	return __xfs_is_ilocked(&ip->i_lock.mr_lock,
+			(lock_flags & XFS_ILOCK_SHARED),
+			(lock_flags & XFS_ILOCK_EXCL));
+}
+
+bool
+xfs_is_mmaplocked(
+	struct xfs_inode	*ip,
+	int			lock_flags)
+{
+	return __xfs_is_ilocked(&ip->i_mmaplock.mr_lock,
+			(lock_flags & XFS_MMAPLOCK_SHARED),
+			(lock_flags & XFS_MMAPLOCK_EXCL));
+}
+
+bool
+xfs_is_iolocked(
+	struct xfs_inode	*ip,
+	int			lock_flags)
+{
+	return __xfs_is_ilocked(&VFS_I(ip)->i_rwsem,
+			(lock_flags & XFS_IOLOCK_SHARED),
+			(lock_flags & XFS_IOLOCK_EXCL));
+}
 #endif
 
 /*
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 492e53992fa9..6ba575f35c1f 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -417,6 +417,9 @@ int		xfs_ilock_nowait(xfs_inode_t *, uint);
 void		xfs_iunlock(xfs_inode_t *, uint);
 void		xfs_ilock_demote(xfs_inode_t *, uint);
 int		xfs_isilocked(xfs_inode_t *, uint);
+bool		xfs_is_ilocked(struct xfs_inode *, int);
+bool		xfs_is_mmaplocked(struct xfs_inode *, int);
+bool		xfs_is_iolocked(struct xfs_inode *, int);
 uint		xfs_ilock_data_map_shared(struct xfs_inode *);
 uint		xfs_ilock_attr_map_shared(struct xfs_inode *);
 
-- 
2.24.1