[PATCH 07/14] xfs: Refactor xfs_isilocked()

Jan Kara
2021-06-15T09:18:37Z

From: Pavel Reichl <preichl@redhat.com>

Refactor xfs_isilocked() to use newly introduced __xfs_rwsem_islocked().
__xfs_rwsem_islocked() is a helper function which encapsulates checking
state of rw_semaphores hold by inode.

Signed-off-by: Pavel Reichl <preichl@redhat.com>
Suggested-by: Dave Chinner <dchinner@redhat.com>
Suggested-by: Eric Sandeen <sandeen@redhat.com>
Suggested-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Jan Kara <jack@suse.cz>
---
fs/xfs/xfs_inode.c | 34 ++++++++++++++++++++++++++--------
fs/xfs/xfs_inode.h | 2 +-
2 files changed, 27 insertions(+), 9 deletions(-)

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index e4c2da4566f1..ffd47217a8fa 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -342,9 +342,29 @@ xfs_ilock_demote(
}

#if defined(DEBUG) || defined(XFS_WARN)
-int
+static inline bool
+__xfs_rwsem_islocked(
+ struct rw_semaphore *rwsem,
+ bool shared)
+{
+ if (!debug_locks)
+ return rwsem_is_locked(rwsem);
+
+ if (!shared)
+ return lockdep_is_held_type(rwsem, 0);
+
+ /*
+ * We are checking that the lock is held at least in shared
+ * mode but don't care that it might be held exclusively
+ * (i.e. shared | excl). Hence we check if the lock is held
+ * in any mode rather than an explicit shared mode.
+ */
+ return lockdep_is_held_type(rwsem, -1);
+}
+
+bool
xfs_isilocked(
- xfs_inode_t *ip,
+ struct xfs_inode *ip,
uint lock_flags)
{
if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
@@ -359,15 +379,13 @@ xfs_isilocked(
return rwsem_is_locked(&ip->i_mmaplock.mr_lock);
}

- if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) {
- if (!(lock_flags & XFS_IOLOCK_SHARED))
- return !debug_locks ||
- lockdep_is_held_type(&VFS_I(ip)->i_rwsem, 0);
- return rwsem_is_locked(&VFS_I(ip)->i_rwsem);
+ if (lock_flags & (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED)) {
+ return __xfs_rwsem_islocked(&VFS_I(ip)->i_rwsem,
+ (lock_flags & XFS_IOLOCK_SHARED));
}

ASSERT(0);
- return 0;
+ return false;
}
#endif

diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index ca826cfba91c..4659e1568966 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -410,7 +410,7 @@ void xfs_ilock(xfs_inode_t *, uint);
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_isilocked(struct xfs_inode *, uint);
uint xfs_ilock_data_map_shared(struct xfs_inode *);
uint xfs_ilock_attr_map_shared(struct xfs_inode *);

--
2.26.2