linux-kernel - [PATCH 3/5] xfs: Use rwsem_is_write

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Message-Id: <20230907174705.2976191-4-willy@infradead.org>
Date:   Thu,  7 Sep 2023 18:47:03 +0100
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Waiman Long <longman@...hat.com>
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Chandan Babu R <chandan.babu@...cle.com>,
        "Darrick J . Wong" <djwong@...nel.org>, linux-xfs@...r.kernel.org
Subject: [PATCH 3/5] xfs: Use rwsem_is_write_locked()

This avoids using the mr_writer field to check the XFS ILOCK is held
for write.  It also improves the checking we do when lockdep is disabled.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 fs/xfs/xfs_inode.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 360fe83a334f..e58d84d23f49 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -339,8 +339,11 @@ __xfs_rwsem_islocked(
 	struct rw_semaphore	*rwsem,
 	bool			shared)
 {
-	if (!debug_locks)
+	if (!debug_locks) {
+		if (!shared)
+			return rwsem_is_write_locked(rwsem);
 		return rwsem_is_locked(rwsem);
+	}
 
 	if (!shared)
 		return lockdep_is_held_type(rwsem, 0);
@@ -359,12 +362,10 @@ xfs_isilocked(
 	struct xfs_inode	*ip,
 	uint			lock_flags)
 {
-	if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) {
-		if (!(lock_flags & XFS_ILOCK_SHARED))
-			return !!ip->i_lock.mr_writer;
+	if (lock_flags & XFS_ILOCK_SHARED)
 		return rwsem_is_locked(&ip->i_lock.mr_lock);
-	}
-
+	if (lock_flags & XFS_ILOCK_EXCL)
+		return rwsem_is_write_locked(&ip->i_lock.mr_lock);
 	if (lock_flags & (XFS_MMAPLOCK_EXCL|XFS_MMAPLOCK_SHARED)) {
 		return __xfs_rwsem_islocked(&VFS_I(ip)->i_mapping->invalidate_lock,
 				(lock_flags & XFS_MMAPLOCK_SHARED));
-- 
2.40.1